Depends on the size of the practice and your role entering (e.g. partnership track vs. associate). Generally larger practices have contracts in place and within 4-6 weeks you should have a draft in hand. With solo practitioners, they may have to get an attorney to draft one, and it may take longer. This is not a hard case, and you can simply e-mail the practice and say "my attorney would like a time frame for the review of the contract so that he/she can plug me into their schedule. When should expect a draft?"
Good luck!