No other member of the of the tournament's stellar cast can match the most durable of No. 8's when it comes to going the distance over the course of 22 matches spread over a gruelling nine months, from the end of one summer to the start of the next.
Heaslip will not waste any time dwelling over his ever-presence in Leinster PRO12 Grand Finals, aware that by Saturday night the record could have been chewed up and spat out as just another bit of grist to Connacht's whirring mill.
While it is true that nobody will have set foot in as many finals, it will also be equally true that nobody will have lost as many should the team of the season finish by springing one more surprise and spiriting the trophy home westwards to the Atlantic seaboard.
Leinster may be odds-on favourites but they have been similarly fancied in PRO12 Grand Finals before and come a cropper. Heaslip, born in the Galilean city of Tiberias 32 years ago when his father, a Brigadier General, was serving with the United Nations, knows all about that from first-hand experience.
The majority of his Grand Finals with Leinster fall into the runners-up category - three defeats out of five. Far from stuffing them into the rubbish dump of history and trying to forget they ever happened, the results stare down at the players from the walls of their gym.
The bare bones are a permanent reminder of what the Ospreys did to them at the RDS in the first PRO12 Grand Final and how the Welsh region found the nerve to venture into the Leinster lair and to do it all over again two years later in the third Grand Final.
The third of that unholy trilogy of losing finals, to Munster at Thomond Park in between being outflanked by the Ospreys, at least provided some mitigating circumstances and not just because it was played in Limerick.
Seven days earlier, Leinster had won the second of their three European crowns, coming from a long way behind to overwhelm Northampton in arguably the most exhilarating performance by any team in a final since Brive ran rings round Leicester at Cardiff Arms Park almost 20 years ago.
The third all-Irish affair preserves the Guinness PRO12's enviable record of never failing to get the top two teams from the regular season into the decider. The semi-finals provided further thrilling evidence that when it comes to delivering big matches on big occasions, nobody does it better than the Guinness PRO12.
Leinster's majestic reaffirmation of their invincibility when it comes to winning home semi-finals prolonged Ulster's misery, as if they hadn't already been stopped far too often in knock-out ties by their old provincial rivals.
In delivering their performance of the season when it mattered most, Leinster served notice of their intention to regain the title they relinquished last year when, for once, they failed to finish in the top four.
Connacht duly responded by beating Glasgow Warriors for the second time in successive matches, this time stripping them of the title they won against Munster in Belfast twelve months ago. In doing so, they banished the prospect of Leinster facing a Scottish team in the Scottish capital, not that anyone in Dublin will be rushing to thank them for that.
Just when the neutrals gape in wonder and reason that Connacht's journey cannot keep reaching new stratospheric levels, they keep soaring ever upwards passing landmarks en route.
Last month, it was ensuring they would play in next season's Champions' Cup. Then it was about reaching the Guinness PRO12 Final. Now it's about winning the whole caboodle in the grand setting of BT Murrayfield and settling for nothing else.
John Muldoon's response to getting there was typical of a Connacht native who, like a true warrior, never flinched during those dark seasons when it must have seemed as if the tide would never turn.
''It's fantastic,'' he said, making sure that in the same breath he spelt out the reality with typical candour. ''But we've won nothing yet and that's the big thing.''
Out of respect to Muldoon and his squad, nobody calls them the Cinderella Men any more. Pat Lam has seen to that, the Kiwi head coach having converted the perennial chopping blocks into potential champions.
A repeat of their last match against Leinster, at The Sportsground in late March, will do very nicely for Connacht. They won that 7-6, thanks as much to a monumental rearguard action under a prolonged siege at the end as to Kieran Marmion's opportunist try and AJ MacGinty's conversion.
A few of Leinster's big guns - amongst them Mike Ross, Devin Toner and Heaslip himself - started on the bench that day before easing their way back after the Six Nations. Their presence from the start will make Saturday's the ultimate challenge for Connacht.
The inspiring challengers wouldn't want it any other way…
Leinster in PRO12 Grand Finals:
May 31, 2014 at the RDS: beat Glasgow Warriors 34-12.
Leinster: R Kearney; F McFadden, B O'Driscoll, G D'Arcy, Z Kirchner; J Gopperth, E Reddan; C Healy, S Cronin, M Ross; D Toner, M McCarthy; R Ruddock, S Jennings, J Heaslip.
Substitutes used: J McGrath, M Moore, L Cullen, S O'Brien, I Boss, I Madigan, D Fanning.
Tries: Kirchner 2, D'Arcy, Jennings. Cons: Gopperth 4. Pens: Gopperth 2.
May 25, 2013 at the RDS: beat Ulster 24-18.
Leinster: I Nacewa; F McFadden, B O'Driscoll, I Madigan, A Conway; J Sexton, I Boss; C Healy, R Strauss, M Ross; L Cullen, D Toner; K McLaughlin, S Jennings, J Heaslip.
Substitutes used: S Cronin, J McGrath, J Hagan, Q Roux.
Tries: Heaslip, Jennings. Con: Sexton. Pens: Sexton 4.
May 27, 2012 at the RDS: lost to Ospreys 30-31.
Leinster: R Kearney; F McFadden, B O'Driscoll, G D'Arcy, I Nacewa; J Sexton, E Reddan; H van der Merwe, S Cronin, M Ross; L Cullen, D Toner; K McLaughlin, S Jennings, J Heaslip.
Substitutes used: R Strauss, J McGrath, N White, B Thorn, D Ryan, D Kearney.
Tries: Nacewa 2, Cronin. Cons: Sexton 3. Pens: Sexton 3.
May 28, 2011 at Thomond Park: lost to Munster 9-19.
Leinster: I Nacewa; S Horgan, B O'Driscoll, G D'Arcy, L Fitzgerald; J Sexton, E Reddan; H van der Merwe, R Strauss, M Ross; L Cullen, N Hines; S O'Brien, S Jennings, J Heaslip.
Substitutes used: A Dundon, C Healy, S Wright, K McLaughlin, P O'Donohue.
Pens: Sexton 3.
May 29, 2010 at the RDS: lost to Ospreys 12-17.
Leinster: R Kearney; S Horgan, B O'Driscoll, G D'Arcy, I Nacewa; J Sexton, E Reddan; S Wright, J Fogarty, CV van der Linde; N Hines, M O'Kelly; K McLaughlin, S Jennings, J Heaslip.
Substitutes used: R Strauss, C Healy, T Hogan, S Keogh.
Pens: Sexton 4.
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