You have to count hours.  This isn't about overnights.  He is just trying to be manipulative.  You should really consult with a local family law attorney to make sure you are getting a fair deal here.I'm having a hard time understanding why you are looking back over the last year anyway.  Child support isn't based on what you used to do--it is based on what you are GOING to do.  It should really be based on your current parenting plan--whatever that is.