If you unblock someone

Yes

I unblocked somebody to free up space since I was approaching the 500 block limit. I had blocked them many years ago

Yet then I stumbled upon their new posts and comments, and quickly re-blocked them a day later. I think you at least have to wait a day.

Yes!

That worked

Your sweet nature angel whispered in your ear to ask this question, didn't she.

Yes although I think you have to wait 24 hours before you can block them again

You can . But I think you have a limit of 24 hours before you can block again after unblocking them

As far as I know you can, try blocking me and then unblocking

Yes but i think you have to wait 24 hrs

After 24 hours.

I think you have to wait 24 hours to block again

Within 24 hrs on here

You can but you need to wait

Yes

Yes