How long have people been swimming on average? rated and current DEC
How long you swim can depend on
your requirements as well as Jet2's. If you want a specific base rather than relocating and joining a transfer list, you might have to wait until space becomes available. Don't forget, you'll also be behind others who have already joined at a non-preferred base and put themselves on the transfer list.
Either way, expansion will continue over the next 7 years due to orders, so no panic. Just my opinion of course!