Babysitter cost

D² • Wed, Feb 05 • 💙12.12.17 👼10.22.19 💖11.17.20

Ok so we are going in for an egg retrieval on Friday and my coworkers daughter will be watching our 2 year old {she was a nanny before moving to England}. It will be about 5 hours she is with our son. How much should we give her in compensation? I know a typical babysitter would be like $15 an hr.