Yes, although DD is at a decent level, she's not at Olympic standard.
DD1 (10) trains 18 hours a week and DD2 (7) trains 6. Different types of gymnastics, so they train different days of the week. Whilst DD2 is likely to go further, that's because she does rhythmic and that is less popular than artistic (DD1) so I think it's easier to make it to the top when there are not so many competitors vying for the same goal.
Even so, I'm there 7 days a week, including every weekend morning, for anything up to four hours at a time. It totally dominates our lives, and DD1 will never become an Olympic gymnast (although her current aim is to become a coach and judge, and that is achievable).
The things I find hardest is when friends organise get togethers and we can never go, because we're always at gym, constantly having to think in the morning when I leave for work at 8am what am I going to give the girls for tea, and taking it with me so I can microwave their food during the day (we batch cook, then reheat main meals), their constantly eating tea in the car (they eat in the car x5 days a week), and the constant shelling out of money. On top of gym, DD1 also does a very little bit of competition dancing. We keep that very low key, but if I'm not paying out for gym, it's for dancing! Then there's the competitions - getting up at ridiculous o'clock to take her to a comp on a Sunday morning. Thankfully DD1's comps are usually within a 3 hour radius, but I understand that DD2s comps will be anywhere in the country.
Of course, I am incredibly proud of my daughters and they can do some amazing tricks, but if I had known what I was really signing up for when I let her join the little development class at 5, I think I would run a mile 
.