I mean, besides saying he is done with expansion, refusing even discuss expansion with Fertitta, and a laundry list of other reasons, there is no definite number. Unfortunate when you take those things into account though. When another league expands past 32, perhaps you will see it. Teams still have a lot more to lose than to gain when considering expansion. The money made from the expansion fee isn't made up from the amount they permanently lose in the future by admitting another member in. It also inherently makes their own franchise less valuable, despite what the NHL has done to artificially raise franchise values.
And last time I checked, no NHL teams are even close to considering expansion, let alone looking at it in the future. So unless you have a few candidates you would care to bring up, it is as unlikely as them expanding.
It is well under 100 miles away. That is not very far and more than reasonably enough in "Los Angele's territory" despite being outside the limit that would require a territory indemnity fee. The number and loyalty of pre-existing NHL fans there is well down the list of things the NHL looks at in a market.