Just a matter of days spent in the mail, plus a couple of days in the shop - ask them if they can schedule the job ahead of time, so you could send over the electronics just a few days before that.
If you're outside of the USA, make sure you declare the product going out of the country - when the package was returned, I ended up paying 25% import duties on the value stated by Alembic, and customs just couldn't be convinced otherwise.
I've been told that if you send stuff not by airmail, then there is less chance of customs interfering.