Xp Boost is riot ripping us off or did they change it?

I bought xp boost on one of my smurfs and well it gets used up if you buy the day boost even if your not logged in right? Does that mean riot is saying that once you buy the boost your supposed play non stop till the time is up or just watch you money slip away while your doing other things? Or did they change it so now you have to be logged in to the client for it to drain away?
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