Pretty sure I remember hitting character limits when playing around with python nostr earlier this year. It was a small number of relays, but a few of them were rejecting at surprisingly low character limits.
Discussion
Ah. It’s up the the relay operator to decide how much to take in, and there are no agreed size?
I don’t think it’s referenced anywhere in the spec one way or another. Similarly I know relays sometimes reject old time stamps, but that is explicitly mentioned in the NIP. But I would imagine one of the other client devs knows much more about this than i do! Hopefully someone else chimes in