If you are going away then you don't add a message saying posting will be delayed, you end all of your listings before you go away.
If you had a shop then you would have the option of holiday settings.
Most of your listings are BINs which means a buyer can hit the BIN button at any time of the day or night, pay immediately and then expect to receive their item. If you don't want to risk coming back from a lovely holiday to find your account trashed by INR cases and neg feedback, then end all of them before go and relist when you return.
