For the women: how long would it take you to put change in a customer's hand?

Suppose you were a cashier at a cafe and one particular customer was a fellow you thought was cute and you had ordinarily put change in his hand when he handed you some money and paid for his coffee. Let's say coffee was one dollar and fifty cents and he handed you two dollar bills. When you put the change in his hand, you placed your hand in his for a couple of seconds, not necessarily flirtatiously but not necessarily not. Let's say he tips you a different amount each day and you just happen to find out somehow he tips you a dollar for each second you keep your hand in his when giving him his change. Let's say it's not a busy day and the boss is not there and the guy comes in again. How long would you spend putting the change in his hand when he ordered his cup of coffee?