Is there a mod that makes it so my sims won't be kicked out of another sims house when it gets late? Where they can stay at another's house for days if I want them to.

Actually, you are meant to ask your host if you can spend the night. It's a social interaction. The Inappropriate But in a Good Way LTR also allows you to do things in your host's house that would otherwise brand you as a rude houseguest, such as cook, clean, take a shower if you aren't already spending the night. Never quite figured out what was so inappropriate about cooking and cleaning for a friend, but anyway...

Once you are allowed to spend the night, Shimrod101 has a Visiting Situation Extended mod at The Sims Asylum that renews the offer to stay over for up to three nights at a time.
http://simsasylum.com/tfm/index.php...ituation-3-days
(free registration required at The Asylum to see anything)