The paragraph you quoted isn't really true for Cookie Clicker nowadays. It's true that the next upgrade may require several orders of magnitude more than you h

The paragraph you quoted isn't really true for Cookie Clicker nowadays. It's true that the next upgrade may require several orders of magnitude more than you have. But it's never necessary to leave the game alone for days; you can get those orders of magnitude much faster by stacking up buffs and combos with all the minigames (pantheon, garden, magic grimoire) and actively clicking all the golden cookies.