Boats tend to have a pretty fixed operating cycle x weeks operational and y weeks maintenance. x & y will vary according to the class od boat. Bombers will be dived and hiding someshere for the whole of their operational time so limited one way comms, shore to boat. Fighter command on the other hand does all sorts of thing so time out od contact will vary depending o what you are doing, smetims you may be out of touch as long as a bomber, other times you will be in port almost every weekend and have no trouble keeping in touch.
Peter