Actually, the way you have described it in the past, not only are there no "term limits" in your troop, there are no terms, either. They are two different things. A term would be six months or a year or whatever, and term limits would be that you can only serve two, or three, or whatever, of those terms. You cannot have term limits without terms, but you can have terms without term limits (as my troop does.) I suspect that there are many troops without term limits, but relatively few without terms. The way you do it, the boys choose someone and he serves until the boys choose someone else, but there is no set procedure for how they decide when it is time to choose someone else. Right?
If there are no term limits it also means there are no number of terms to consider. A lazy scout's term in office might be a week or two and a go-getter scout's term might end when he turns 18. Either way, it's one term. There's no selection/election process defined. No schedule of elections on a periodic basis either. The 6 month, 12 month stuff is made up by the adults, not the BSA. Also who can and who can't be considered for office isn't a BSA policy either. I just don't play the game and if something goes wrong, I don't get caught holding the bag. If there's a problem, it's up to the boys to work it out. PL, "For the next 3 months I will be busy with basketball in school. Joey, the APL will be standing in for me, his phone number is: (000)-000-0000. I'll try to make the meetings, but he will still be the acting PL during this time." Of course PL Johnny might find in his absence, Joey is doing the job 10 times better, just to find out the boys now have made Joey PL. That's life.