To clarify for the benefit of the masses I presume you mean the guys on special leave (unpaid) that are coming back online with their leave coming to an end.
As an aside they also have contract f/os to fall back on as well which in the main were made up of ex captains that came back to the rhs through Parc for the summer.
No idea how long you will be swimming. I would presume it will depend on what plans management have for the summer schedule.