The game does autosaves and shows a red error screen, when it isn't possible. So in theory you can't play for hours or even days without a save. There might be anohter problem with your savegame. Please create a bug report with some more details on your progress, when you lost it and what you've done before that. Sorry for the inconvenience!
 "Crafting Idle Clicker"){kind=icon}
 "Idle Castle Crush"){kind=icon}
 "Blackmarket"){kind=icon}
 "Galactic Clicker"){kind=icon}
 "Idle Goo"){kind=icon}
 "Clicker Heroes"){kind=icon}
The game does autosaves and shows a red error screen, when it isn't possible. So in theory you can't play for hours or even days without a save. There might be anohter problem with your savegame. Please create a bug report with some more details on your progress, when you lost it and what you've done before that. Sorry for the inconvenience!