The time/effort involved in chatting up/entertaining your girlfriends nosy mother/ suspecting father/ peskyyounger brother/ sister when you go to her place to pick her up for a date.
Male 1 : Im off buddy. Gotta pick my girlfriend up at 9.00 for our movie tonight.
Male 2 : Wait up dude. its only 7.30. what will you do going so early ?
Male 1 : yea i know. Just making sure i pay the requisite date tax.