PPD displayed is Points Per Day. That means that's the amount of points you would get if you folded 24h a day. If you are not folding 24 hours per day, PPD will drop dramatically. The quicker you return the WU, the more points you can get. Passkey is enabled after 10 successful WUs returned without fail, and staying above 80% of return rate.
I hope I understood what you were actually asking for, since it is very hard to guess what you mean "barely" or "like crazy". For some, "barely" might mean 5 point increase a day, for others, 10m points increase per day. For some "like crazy" might be 2 WUs per day, for other 25 WUs
