The command estimatedTimeLeft only works with values < 7200, it would be nice to increase this value to provide the functionality of this command for servers with restart cycles of 4 hours or even more.

A 4 hour restart cycle would be 14400 secs.
A 12 hour restart cycle would be 43200 secs.

If you try values higher than 7200 the estimated time until restart is blank in the server browser.