My son is 4 years old and has a playdate today at my home. On Friday I ran into other child's mom and child (mine was not present) they asked for a playdate and a time of today was set up. (at moms convenience). She just called to tell me that she is dropping her off and will pick her up about 1 1/2 to 2 hours later!! Is this appropriate at the age of 4? The last thing I wanted to do today is babysit!!