If you have young children, how much time do you get to yourself?

[Classicblunder]

By which I mean time without the kids, work or chores?

We have a 5 year old and a 3 year old, I work 4 days a week and have the 3 year old on my non working day.

I think in total, I get maybe an hour a week each weekend, evenings are sort of free time but do involve cooking dinner, bits of life admin, sometimes catching up on work.

I feel like that's not very much but maybe it's normal?

Pretty normal for that age children to be fair. They're still very dependant on grown ups.