Since the 1900 is a very, very large version of the original King Air 90, I can tell you the pilots are having a nice time. Piloting for two hours will be fun, being a passenger for any time at all is painful. I took a Saab 340 for a 2 hour flight twice a week on AE some years ago. After a while I got used to it. The seats on these planes aren't comfortable but people have survived these flights for many decades. You can too.

if you can find something larger, take it. Survival is not you only objective in life, probably.