How much time do you spend signing your signature on minor purchases like groceries?

Me, about ½ a second. It’s “V” followed by a hastily scrawled line. ZIP! I’m done.
It drives me crazy when people so slowly and meticulously sign their electronic signature for that $1.00 fountian drink they bought, like they just took out a $500,000 mortgage.
The machines don’t care. I once scrawled a happy face in lieu of my signature. It was accepted.