I played for about 3 hours and got off only for me to get on a while later and find that none of my progress saved i was wondering if this was common

When playing the Game, make sure to leave the File In which you first started the game open, Example leave the Winrar file there and don't close the tab, Once you are done playing, THE GENERAL COMPUTER, NOT THE GAME asks if you want save the changes made to the "File" Aka the game, Click "Save Changes", it will take a while to completely save but its better than loosing your hard work