I think you were referring to this .

Most coupons i've seen require 2 day keep with a Saturday night thrown in. I'll be on a plane on Saturday night, and can't meet that requirement. I can of course rent earlier (i.e on Thursday after Noon) even though i only need it for one day on friday through my return on Sat afternoon.

Right now, i have a economy booked at a HLE in Sunnyvale with a return at SFO for $43.00. Too high. I may just end up redeeming a one-day cert.