Somehow I went from despising the trainer and avoiding it all costs, to not minding it a few years ago. I would do 2 hour rides no problem, and an occasional 3 hour ride. Nothing structured most of the time. I downloaded stage races, and each stage is often 2-3 hours, so it worked out well. Just listening to music does not work for me. Sometimes I play techno type music with a good beat on low volume, and watch racing at the same time. I just use a regular 3 speed fan on a table.

I also got pretty adjusted to riding in the cold. Good clothing and layers is key. Does not have to be expensive though.

I'm sure there are tons of clothing threads in the "Winter Forum".