I can't really talk about high level, elite track training. DD was offered a place in the HOPES/ELITE track. They train an extra 2 sessions weekly, during school hours. We opted out of one of those as I wanted her to keep up with school as well. We didn't really plan on her going elite, just doing our feet in to see where she would get to. She was training 24 hours a week at that point.
So she got the compulsory and optional scores a day apart in a large qualifier meet. Though you can often get the compulsory qualifier at many smaller registered meets. DD competed at 2 competitions in the HOPES division that session but didn't make the nationals score. We could have gone to classics but opted out in favour of her first level 10 nationals.
Happy for her that she had the experience but we pulled out are that season as she was beginning an elbow injury. She has been happy at level 10 since and it's too much of a jump to make it to elite without training 30+ hours a week. DD is really happy to have done that extra workout and had the experience. I think the extra attention helped with her form on a lot of skills going forward.
My youngest daughter is 9 and beginning to train HOPES after regionals. She competed level 7 this year but has all her level 9 skills already besides the vault... Just so you have an idea what level other kids are on.
Hope that answered some questions, happy to answer more!