See the latter part of page 1 of this recent thread:
https://www.walkhighlands.co.uk/Forum/viewtopic.php?f=1&t=92365As rockhopper and WWW say, there aren't (thank goodness) any rules on this: both basic approaches - start again or stockpile - are valid, and it can be fun to keep tabs on both if so minded. Occasionally you hear someone taking a hard line, but that's pretty much invariably from the "start again" side - I'm not sure I've ever come across a cumulative stockpiler telling people that they *mustn't* wipe the slate clean and start from scratch.
It tends to be heavily governed in practical terms by how many repeats someone has on completion - if it's fewer than 20 then they're quite likely to start again, if it's hundreds or even thousands then they're unlikely to, as it would seem daft.
Good luck with the last two anyway - hope you get good weather for them. A Stirling friend completed his (first and almost certainly only) round in mid-November a couple of years ago and was really lucky with conditions - nice and bright with some thin snow.