I live in the accounting world too - the tax side. My DS got hand foot and mouth literally two weeks before the 9/15 tax filing deadline. I would ask your daycare their policy - typically once the blisters show they were already contagious so my daycare's policy was that if they had a fever, they couldn't come in until it was gone for 24 hours but if blisters were still present that was fine. Which was good because DS had "one of the worst cases" my doctor has seen - he had blisters for a solid two weeks everywhere! And as part of the backlash, he is now losing toenails and fingernails left and right which the ped thinks is as a result of blisters coming up under his nails and separating the nails.
All in all, I missed one day of work - my husband and I both stayed home the day after he was sent home with it and I worked in the morning, then did my son in the afternoon while he worked, and then I worked after he went to bed- which is the norm these days anyway.
We used lots of advil and Aveeno oatmeal bathes which helped alot - for how many blisters he had, I was shocked that the only thing that slowed down for him was eating/ drinking which we watched closely due to the blisters in his mouth. Good luck!