You can call the the housekeeping manager (look on your room phone a Housekeeping button, or digits to dial.) They can usually (but not always) accommodate such requests, it just depends how many rooms are already scheduled on a given day. Since you have 2-five day stays, you are only getting trash and towel service, so you'll likely have no problem rescheduling service days. But be sure you call housekeeping directly, and do not make the request at the front desk...inter-department communication isn't always reliable.