On Windows, the context menu of ManicTime's tray icon has "Go off the record" with a sub-menu for the desired duration. But if the user clicks on "Go off the record" directly, the default is "Until you turn on".

The best would be to not do anything and force users to make a selection in the sub-menu, but now that it's been like that for a while, the best alternative would be the option to set which timeframe is used.

The number of times I've lost a long period of tracking because of this...

Or a setting to be reminded periodically that we're off the record or even that ManicTime isn't even loaded...