D son's gym, it seems the girls took about 3 months for the group i have seen.....from straps to pit to UB, with a spot. The girls I see are now doing them on the regular bars, with a spot for some of the girls, others, no spot. (of course i dont know how long they were on straps)
D Daughters gyms, seems like an eternity......girls are struggling with them for months and months.....only two girls are doing them consistently unspotted.....
gym variation of course is, time in the gym, time on the apparatus, and number of coaches working the skills. Sons gym has TONS of coaches while Daughters gym has 2 coaches.