It seem like most gyms in US have LONG practices from the early levels. Ours are not that long so the girls have more practice days. Usually the number of days increases before the length of practice. In my club it goes like this:
LEVEL A : no competing, 2-3 practices a week, 1,5-2 hours each (08's and 09's mostly)
LEVEL B: starts to compete, 3 practices a week, 2 hours each (07's and 06's mostly)
LEVEL C: 3-4 practices a week, 2-2,5 hours each (05's and 04's mostly)
LEVEL D: 4-5 practices a week, 2,5 hours (04's, 03's and 02's mostly)
LEVEL E: 4-5 practices a week, 2,5-3 hours each (03's, 02's, 01's and 00's mostly)
LEVEL F: 5-6 practices a week plus morning practices with school, 2-3,5 hours each (high school age girls)
Our elite squad girls have more days and more hours from age 7-8 but I think their longest day is 3,5 hours total. Most of them also have at least one morning practice due to school when they do independent work or work with one of their club coaches for 1,5-2 hours.