VicStats shows various metrics regarding the current Mainnet including the current number of Masternodes, Masternode performance, current TPS, block-time, confirmation time, finality, and other useful metrics.
It should be less than a minute after the tmn command is executed and finished.
The stats page is javascript code running in your browser. If your computer loses internet connection or the page is not active anymore for some reason, the time will increase forever. In this case, just refresh the page.