41 C.F.R. § 302-3.206

The employee and their immediate family may travel to another U.S. location (other than to their place of actual residence) under a tour renewal agreement. However, the agency will only reimburse for the amount of authorized expenses from the post of duty to the place of actual residence and return (as appropriate) on a usually traveled route. The employee is not required to spend time at their place of actual residence to receive reimbursement; however, a substantial amount of time must be spent in the U.S. if the place of actual residence is located there.