Suppose you talk to your girl one day, and you decided to have a date two days from now. Later that day, you browse the net, and order a book, and it will be delivered 3 days from now. Then you go to a tailor, and order a new suit, and that will be done a week from now.
Now, let's say all this happens in a game.
Assuming the player and/or character is willing to do all three of those things, is not in any particular hurry, and has enough money, what sort of in-game reason would you give for forcing player to choose only one of those three. The sort of realistic reason that would actually make common sense, not just "picked 0 out of 1". And more, even though the player/character is not really in any particular hurry, what sort of reason would you create to make player care about how much in-game time will each choice take to complete ?