I've had occaision to have to temporarily close my store and was able to re-open today.
As a test, it has been postulated before but I wanted to confirm, what happens if one needs to have a time away longer than the 30 day limit.
Today I ended time away and immediately went back in and was able to start another time away beginning today, for another month long duration, so there was no risk of someone purchasing something in the brief time my store was "reopened".
So as long as one is able to end time away and immeditely restart it, one can extend it for as long as one likes or so it seems.