If your reimbursements go back onto your paycheck, you shoud see the reimbursement appear on your paycheck in 1-2 paychecks.  

If you receive a check or direct deposit, reimbursements are processed on Saturdays.  
Checks go out in the mail on Monday and will arrive at your address on file in 7-10 business days
Direct Deposits are processed on Mondays and can take 1-3 business days reimbursements to hit your bank account.