User blog comment:CCHIPSS/CHIPS' Game Guide/@comment-205.250.227.35-20140219174533

The Sealstone Collection Event is a new event introducted recently. Taking "Orochi's Winter Vacation" as an example, this event lasts 7 days 8 hours, or 176 hours. This is 10560 minutes.

To get the 5* you need 60 completions, so at least 360 SS (if you are godly lucky).

10560minutes/360SS=29.33minutes per SS.

So if you play 24/7 during this event, and all your SS fits perfectly into place, and no one attackes you, you need an average of one SS every 29.33 minutes.