Mine are now Y9 (13) and Y6 (10). Both went to nursery from 7.30am - 6pm from 12 months old as DH and I both had long hours, City jobs. They used to go to a nursery behind the bank DH and I both worked in. I'd drop them in the morning and get in around 7.45am (late for my job) and DH would pick them up at 6pm when he'd finished (and I was making up hours). I did drop to 4 days a week until they started school and went back to FT then. It was an early start for them, but mine and DH's jobs are not the most secure (banking) so it was important we both maintained our careers. We were glad we did as we've had 3 redundancies between us since we've had DC and had periods where only one of us was working and having to cover all the bills.
Once they started school we moved to a local wraparound who would have them 7am - 6.30pm which again meant long days for them, but they've never really known anything else. The wraparound we used were really flexible and happy to pick them up after sports fixtures and also took DD to gymnastics for a couple of years after school which we couldn't have facilitated otherwise as it was 4-5.30pm.
They've grown up into happy, well adjusted and very independent kids. Both swim competitively meaning 7am pool training and the early starts haven't been a problem as they're so used to them. I've never missed an assembly/sports day/prize giving etc, I'd take leave to make sure I went. I did miss out on the playground chit chat, but it hasn't stopped DC making friends and going to lots of parties, playdates etc and I've made friends through those.
It's not ideal, of course not, I used to feel so guilty waking them up so early in the winter and had so many comments from friends/family/strangers on the bus, about how cruel I was. I'm sure if given a free choice they probably would have preferred either DH or I to be at home, but we've been able to pay two sets of private school fees because we both carried on working, we have a lovely home, good holidays and enough savings to be able to pay for uni and help with house deposits when they are older. Overall, we're happy with the choice we made, it was a sacrifice of c.10yrs to provide financial stability for the rest of their lives.
I'm very firmly of the view though that there is no 'right' or 'wrong' answer, DSis took a totally different view and left work to be a SAHM when she had her DC, they are also happy, well adjusted kids, she just took a different decision for her family.