Post patterns you want, and I'll try and get you a tripcode with that pattern.
4-character, 5-character cased, and 6-character uncased is immediate.
6-character cased and 7-character uncased is 2-3 minutes on average.
8-character uncased is 30 mins, lower with leetspeak.
7-character cased is multiple hours.
If you have a long term one, drop an email - I'll deliver, no matter how long it's been. Or if you're going to be using it as an identity, because otherwise it just gets posted to the thread.
Jap characters are faster, so if you can't use them for whatever reason, say so.
Spam the thread, and you don't get shit.