the half life for any marijuana strain is a max. of like 5 hours. this means after 5 hours, 1/2 of the active molecules you have smoked become inactive, therefore your high goes away. i highly doubt either of you have been high for 2 days. now it could be what i used to call a weed hangover. when i first started smokin like 7 years ago i noticed that when i would smoke at night before i went to bed, the next day i would be kind of out of it and grogy, couldnt concentrate like usual, but the nights i wouldnt smoke i would feel fine and extremely energized the next day. this is what i deem as the weed hangover, dont think you were high for 4 days