I had a litter of 10 day old orphans earlier this year. Yes, they are a lot of work, and need round the clock feedings (they cannot go 8 hours without food at this age). My husband and I set the alarm clock all night long to get them thru their feedings.
Have you ever done this before? There is a LOT of information to know about kittens this young from their environment, to feeding, to elimination (you have to wipe their behinds until they are 3-4 weeks old), bathing, keeping them warm, etc, etc, etc.
If my husband didn't do as much as I did, I don't think I could have done it by myself (I also work). He or I had to be at the house 24 hours a day until they were close to 5 weeks old. It gets easier once they hit 3-4 weeks old, but still need round the clock time until they are fully weaned.
I found the experience highly rewarding, but it is not an easy thing to undertake. I would not think you were crazy to do it as long as you know what you are getting into.
There is a woman in my area that does nothing but orphaned kittens and puppies. If I find a litter this young again, I will be calling Wanda next time.
I hope this helps - please let us know what you decide. I remember contributing to a thread a while back that talked about hand raising orphaned kittens, and there are a number of websites out there on the topic. I will find those if you decide to go forward with this.