There are plenty of sitters that prefer long sits - we’ve done a six week, a two- month sit and 4 x three week sits this year.
The pros and cons of listing split dates has been discussed here:
https://forum.trustedhousesitters.com/t/splitting-a-sit-to-find-someone
Most sitters don’t like split sits as there’s the potential to be blamed for something the previous/ next sitters did.