Tranter's round: what and why?

Tranter's Round is the original Scottish 24-hour mountain challenge, consisting of Ben Nevis, Carn Mor Dearg, the Aonachs, Grey Corries and the Mamores. This circuit of the river Nevis watershed is about 60km long with about 6000m ascent and was first achieved by Philip Tranter in June 1964. Originally it consisted of 19 Munros, but now has only 18 due to Sgorr an Iubhair losing its status in 1997. The standard Scottish 24-hour mountain challenge has been (Charlie) Ramsay's Round since he completed it first in July 1978. This extension Tranter's Round adds five Munros round Loch Treig. Although this offered the appealing challenge of 24 Munros in 24 hours (until Sgorr an Iubhair' demotion) it doesn't appeal to me because 

• It is too long and hard for me to contemplate, being 96km long with 8500m of ascent
• It is not as aesthetic since the additional mountains are not in a natural sequence and require a long low-level trek between Loch Ossian and the Mamores

So far as the 24-hour Munro record is concerned, Ramsay's Round itself has been extended on two occasions to 26 and 28 (now 25 and 27) but two longer records have been set in the Cluanie/Affric area with (now) 27 and 29 Munros. Interestingly, these records were set 15-30 years ago, although the first 24-hour Tranter's Round in Winter was achieved in 2009 and a 24-hour Ramsay Round in Winter remains an open challenge.

The record for Tranter's round is currently 12h17. I'm aiming for 19 hours, which is only 12% faster than the 21h45 given by Naismith's Rule. When running in the hills I'm normally about 100% faster than Naismith, but that's for a couple of hours in the Pentlands, not 19 hours in Lochaber!

Oh, and why do I want to do it? Because I think I can, but if I wait too long I'll be too old and I think I'll regret not having tried it!