Seriously. Waiting 8 hours to get a bs is NOT cool, because you're gonna be losing on the DP and even if you use it while sleeping, you could wake up and check the game before those 8 hours of idle. So why not just rework it again
I'd say to rather do one of these two options (or two because nobody is gonna argue that it's bad for their progression)
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1 special activity: you're gonna get a guaranteed bonus stage after you stay active for over 1 hour (or 30 mins if you prefer) . This DD will cost 300 DP (because I KNOW it's op)
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2 special promise™: it's basically the boring rework of the current special promise, it will just change that instead of after 8 hours of nonstop idle you'll get a guaranteed bonus stage, it's gonna be 8 hours of idle (accumulated) example: I sleep for 6 hours, that's while idle, and after I check the game to just send the minions and collect them, I stay idle for another 2 hours then I'll get a guaranteed bonus stage, the price will raise up to 150 DP because since it's buffed the price must be increased as well