If you are staying in the same cabin, I think holding till end of second week for cabin steward is acceptable. You might want to check and see that the staff is not in a change (transfer) status. It would be a shame for the waiter or someone else to change ships, and miss the tips. I'm sure this will be brought to your attention if there is a problem. #1 idea is to check with your TA/cruise line rep. Happy kruzin'
Peace & Love, ED