Post patterns you want, and I'll try and get you a tripcode with that pattern.

You can expect 5-character cased or 6-character uncased immediately.
You can expect 6-character cased or 7-character uncased within a couple of minutes, but you're still at RNGsus's mercy.
Anything longer and you're going to be hanging out here a while.
Make sure you say whether your request is cased or uncased (and if you're okay with leetspeak).
If you have a long-term one, drop an email if you're leaving or if the thread hits the bump limit.
Jap characters are faster to generate - if you can't use them because of allergies to weeaboos or some other reason, please say so.
If you spam the thread, you don't get shit.