HisDudeness3008: This may be a stupid question, but is there any way to know how much days has a discount on a game got left? Right now there is the Monstrous Fall Sale, and many games are part of a bundle, for which a countdown can be seen. e.g. promo/20161103_fall_sale_double_fine_bundle
For all bundles the time left is the same (until ~ November 13 22:00 GMT), which brings me to think if a game is on sale because of the Monstrous Fall Sale, it will be until that date. The problem is I can't seem to get if a spare game, e.g. To the Moon, is part of that sale (hence, discounted until 11/13) or on its own (and, as such, #% off until n unknown moment).
Not a stupid question, more a serious lack of a feature here on GOG. You can't get that information on the game's shop page, you actually have to know which promo/sale the game is part of. But in this specific case, we are told that all games currently on offer will stay discounted until the end of the Monstrous Fall Sale.
Well, except for the new releases with a temporary 10% discount or similar, maybe. But To the Moon should be part of the sale. EDIT: Yup, it is, just found it in the sale's Adventures tab on the front page.
I think the only way to know for sure what sale a game is part of is to check the ads on the front page and the news articles.