Back when I was working a full time office job before I moved to my current city, I was on the ice during publics in the evenings, and for teaching class (wasn't true practice, but there was minimal improvement since I was at least on the ice every day). I would skate Thursday morning at 8 for my lesson because they rarely held anything earlier. There just wasn't enough of a turnout to warrant opening the rink at 6am, and we had maybe, MAYBE 5 dedicated adults skating. The rest were parents who learned just enough to get on freestyle to skate with their kids.
When I moved, I could only skate weekend mornings and the occasional evening public in another city because I worked 8:30-6, sometimes 7:30 everyday, and getting on the ice at 6am and having enough time to pull myself together with the traffic my area gets was not doable.
After I got fired and started freelancing, my options changed, though I stuck to public sessions most of last year and academy classes. So I was on the ice maybe.... 4 hours a week? Each public was an hour 45, so just depended. But those were not super productive if certain skaters were there because they would carve ruts all over the ice which limited what I felt comfortable doing.
Now that I'm established and back in private lessons, I'm trying to make 3 freestyles a week plus lesson. So roughly 4-5 hours of skating if I'm not on deadline. Right now I'm dealing with a rolled foot, so I've barely been on the last week, but once that's healed my goal is 4-5 hours a week of freestyle.