I've made a game that I feel is very fun, but may be too long for a consumer. Therefore, I have done some things to increase the playability:
1) I have split the game into a regular play (~10 hours), a short play (2-3 hours), and a speed play (30 minutes). You get a bigger taste of the game with a longer game. The mechanisms all remain the same, but the options (and thus the strategy level goes up).
2) The other thing I have done is implemented a way to "save the game". My game is a board and card game, and by saving the player cards in a pouch, you can save the current state of the game, if not the specific board positions. (Though the game is not similar to Monopoly, think of saving that game by storing the property cards, and then starting out the next game by distributing the cards and starting at "GO".)
Is the strategy of the 3 lengths good? Is 10 hours too long? How about the concept of "saving" a board game?
Hello and welcome!
Unfortunately we don't have enough information to give you an answer about your game.
Length of game play really depends on the scope and the style of the game. Many games of evolution and civilization building don't really hit their stride until after the 2nd or 3rd hour. Some wargames can't be completed in less than 12 hours or more.
That doesn't meaen that all games could run that long. I enjoy playing Ticket to Ride, but can't imagine a game running 2-3 hours.
Your game may very well find an audience that will play it for 10+ hours depending on the type of game you have created.