building structures is a boring and a repetitive task in totem tribe jotun, so why not spice things up by giving the opportunity for players to play mini games in order to cut off specific amount of time...
In order to shorten the building time you would have to click on a building that is currently being upgraded or constructed, a GUI would open, there would be an additional button, with the words "speed up", once it is clicked, there would be 2 more buttons, 1st one would say "by game" and the second would "by items". Choosing the 1st button, you would have 3 more choices : Small game ( 15 mins or 5-15% of time skipped (Idk, maybe needs re balancing)) - a game could be something short, like 3 rounds of gomoku or something. Medium game ( 45 mins or 20-30% ) - like russian checkers. Big game ( 120 mins or 40-60%) - chess, Sudoku.
If you have lucky coins, you can try your luck on instantly finishing a building with casino games like 21, or poker.