We keep our boat on the Broads, at Horsey, where there are three other Seals, by the way.
We often spent a week or two and day sail often. We drop the mast, using the spinnaker pole as a pitch pole, as set up by Bill when we bought the boat. It takes us about 40 minutes to down mast, go through a bridge and have it all up again. We could be quicker but we are quite cautious and like to double(triple!)check things. I'm sure it makes the Broads cruisers laugh at the time we take but it works fine.
We have added a crutch that is permanently at the transom ready to catch the mast but do not have to slacken shrouds. We do detach the boom and mast slides but not the reefing lines.
Please ask if you want any more details.
Brian and Alison Fisher P235 Thrift