p4o2 wrote:

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 have calked all I can find at night so I think they are all inside.

Adults may survive a long time as you'll not make it airtight and there
well may be alternate routes they can use to escape that you don't know
about. The eggs they've laid will winter over and hatch next spring.

IOW, that ain't the most promising way to get rid of them.