I'm not a single parent, however, my husband and I go out of town on occasion for work so there are times where I am the only parent for a few days. The longest I have been the one and only parent was for two weeks when Ewan was about 8 months old. That was really hard. He was cutting FOUR teeth at once and didn't sleep well at all. I honestly don't remember much about those two weeks, they are a sleep deprived blur.
Single parents, I give you props. Doing this by yourself definitely isn't easy!