If I add a game or DLC to my cart, how long do they stay there (without actually making the purchase) ?
For example, I add something at night (I log out of steam), they will stay in my cart on the next day when I log in to Steam again?
I go on a holiday for a few days, my cart will stay as I left it?

I just don't have much free time and I want to add some games to my shopping cart, and then pay for them in the end at once.