The Statute of Limitations is what is limiting you from inviting over/spending time with
acquaintances. After you've known someone for a long time, but you've never done anything with them, it becomes weird to invite them over.
If you don't hurry up and
do something with someone you just met, the Statute of Limitations will run out, and then you won't be able to.
"Honey, we should invite Dan and Annie over
for dinner! We've been
neighbors so long and we've never really gotten to know them!"
"We can't to that! It's
too late, the Statute of Limitations has run out."