When I arrived in Early Oct 2017 i went onto a pontoon. After a week I left for 3 weeks and I was required to be on a
mooring as I didn.t have someone that could tend my lines in case of surge. When I got back I was able to leave the mooring and rejoin on a pontoon where I stayed another month and finally left late Nov 2017. It was very windy when I was there and a surge at times. Depending on the size of your
boat (most on wharf or pontoons were 46ft or less.)and time of year I think you could leave your boat for a month. The alternative is Madeira itself or a 2 day sail to
Canaries. --