Until the end of the DP event, which is probably multiple days.
I don't know how long it'd take - a few hours at least. Heck, a few hours is probably what it'll take for you to fumble around in DP's terrible, terrible UI... ... but once you figure shit out, 300 Alyssa Coins is probably like 2-3 hours? There's multiple posts in this thread that talk in detail how to get them.
As for the rewards... well, there's a guaranteed Hime weapon (so probably a R Hime), and a 10-pull. Nothing very good, really, but... free shit is free shit.





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