20 mins in man time is approximately 1:25 hours in woman time. This definition is applicable when a woman (whether it be your mother, wife, girlfriend, female adequatence) claims she will be going somewhere (usually the store JUST to grab milk or to the pharmacy JUST to grab one thing) is gone for much longer than they told you. Woman think men do this but in reality it is them who do this. Usually their excuse is they "ran into someone" that they haven't seen in ages or that their was some deal at target or old navy, usually some shit like that.
Mom: Ill be gone for like 10 mins don't call me
*1:15 hour later*
Kid: Mom where you?!
*thinks* God damn woman time.