In 2013 Outlook, Excel, Word and Access, when I hover the mouse over Format Painter, the info tooltip stays open for 20 seconds and then disappears. In IE11, a few tooltips I tested stay open for 5 seconds--so I conclude it's an Office setting rather than OS.

I had a look in...
HKEY_CURRENT_USER\Control Panel\Mouse
...but don't see a setting there which looks probable, none of them have values of 20 or 20,000.

Does anyone know if there is a setting somewhere where this value can be changed?

It's not an issue generally, but is for an Excel add-in I use, ASAP Utilities. The tooltips in ASAP are long and useful, and 20 seconds is much too short to digest the info.