Here's roughly the curve I'd want to follow if I were designing a girls team program right now, and had enough space and equipment to have at least 50% of the group on equipment at any given time, and lived in a perfect world where there were never any scheduling conflicts:
L2/preteam:
-15 min warm-up/basics
-15 min conditioning
-30 min each on bars and one other event
-15 min trampoline, etc
-15 min stretch/cooldown/conclusion
3x per week.
= 6 hours/week
L3:
-15 min warm-up
-15 min floor basics
-30 min conditioning
-30 min each on bars and one other event
-15 min trampoline, etc
-15 min stretch/cooldown/conclusion
3x per week
= 7.5 hours/week
L4:
-15 min warm-up
-15 min floor basics
-30 min conditioning
-45 min each on bars and one other event
-30 min trampoline, etc
-15 min stretch/cooldown/conclusion
3x per week
= 9.75 hours/week
L5 - L7:
(Same as L4, but 4x/week)
= 13 hours/week
L8 - L9:
-15 min warm-up
-10 min handstand basics
-10 min tumbling basics
-25 min bars basics
-30 min conditioning
-1 hour on 1 event
-30 min trampoline, etc
-15 min stretch/cooldown/conclusion
5x per week
= 16.25 hours/week
L10:
(same as L8-L9, but 6x/week)
= 19.5 hours/week
Elite, training full-time:
-15 min warm-up
-10 min handstand basics
-15 min either bars or tumbling basics (alternating)
-20 min conditioning
-1 hour on 1 event
-30 min trampoline, etc
-15 minute stretch/cooldown
10x/week (meaning at least some of the days would have both a morning and evening workout)
= 27.5 hours/week
Having said all this, in the real world lower levels would have to stretch things a bit longer due to group size and infeasibility of having enough space and equipment to always have at least 50% of the group working; L10 and elite groups, by comparison, tend to be much smaller and are thus able to work more efficiently.
I'd also (remember, we're talking theoretical perfect world scenario here) want level 5 and up to have an hour or so of "open" workout each week, where they could pick whatever events and skills they want to work on, but that wouldn't be an every-practice thing.
For any practice that's within 2 days of a meet, I'd cut out conditioning entirely, and rather than doing one or two long event rotations, I'd have them do one or two routines on each event.