p4o2 writes:

I find 193 posts on wasps in this group but can not find an answer to "
how long will a nest survive after all entrances exits have been sealed
? "

I would expect until cold weather kills them off. They may be like many
other insects that cannibalize each other to survive as a colony.

You likely mean hornets or yellow jackets, not wasps.

A better technique is to put repellants at the exit rather than an absolute
barrier. Then they'll go out under a compulsion, but not back in.