Rosebud, people love to talk about the short finish of the 89 NL5, which is 45-52 days in most phenos. I found one that went 55, and I've popped a lot of the beans I made, but the majority are 50-52 days.
What they don't talk about it is the slow indica veg. And that snail's pace starts from sprout. I'm actually surprised to see one of the three up in 3 days. To maximize the number of sites for those hard nuggets to form they need at least a 60 day veg, with only one topping necessary to keep a short bush in flower. So the finishing time is basically washed out by the veg time, and you get the same finish from sprout to finish as any other indica.
But, in a perpetual, that short finish sure can help ease the lack of harvest between longer finishing hybrids, if you time the flip right.