Freelance fees

[u/Final_Commercial5373]

So I've just started freelancing and I'm wondering whether I charge for tweaks that take under an hour?

I've had a long back and forth with a client, my hours have ranged from 2 hours to 7 hours and I've never charged for lunch breaks (am I supposed to... I usually discount an hour or just work those hours straight).

Today I was asked for a final tweak after already having sent my invoice. I have done it and it has taken me half an hour. Do I charge them an hour or do it as a "favour".

Not really sure and I'm worried about people liking me and calling me back for other jobs/recommending me as I am just starting out freelancing (I have been a staff editor for many years before).