If you are getting a 2hr database check then sounds like your mail database has got a big error
in it somewhere, and you should really be looking at deleting your mail database and starting again.
If you have an eg: IMAP type account i would personally uninstall the program and delete the database on uninstall and then download the same or later version from the eM Client ver history page and reinstall & setup as new again.
You can check what current version you have via “Menu / Help / About”.
If you then keep on getting checking for errors on startup, make sure you are exiting the program and waiting aprox 5secs before shutting down your computer so the database closes correctly.
Sometimes database checking errors on startup can also be caused by “other background programs” interfering with eM Client closing correctly so you think it’s closed ok, but it’s infact still open in the background when you shutdown.
You can dblcheck it’s really closing after you have exited in the task manager for Windows and Mac.