I have often washed base layers etc on three/four week trips and hung them out on the balcony ready to go again next day so that's not a worry.
My second bike is an F800 with a Rallye seat which is only 150 mile comfortable so my thoughts turned to multiple days riding on a seat that might well be uncomfortable, or may well be grand but I'd like to have an option. I tried an air cushion many years ago but I felt removed from the feel of the bike and didn't really like it. Similarly, as suggested by
@enabb I tried a sheepskin too which didn't seem to offer anything really.
Thank you indeed
@Victor c for your input which is very useful. I'm not flying out until Friday 14th so I might just buy a pair to have so I can test them if the bike proves to be uncomfortable.
Many thanks to you all for your thoughts. I appreciate it.