I don't think there is a single answer, it depends on several factors like:
- wind and sea conditions and the predictability of any change in that
- whether your boat has a roof or not
- how many engines you've got
- available safe havens in the event of either weather or mechanical issues
In the case of these parts the answer is usually not very nice and somewhat unpredictable, no, one engine, and hardly any in that order, which tends to restrict what you do just in the interests of self preservation.
I guess my furthest is probably about 30nm out and the same back but on a nice day, the problem here is you could go that far and find you have 25kt+ of headwind to contend with all the way back which is no fun at all with that distance to go and no safe haven you can leave the boat at. I was out only a few weeks ago and coming back in I was down to less than 10 knots due to a sudden increase in wind/sea so it took me the best part of an hour to cover something that normally takes less than 10 minutes and it was very uncomfortable.
Multi engines, a roof and a bigger boat all improve the situation dramatically