Open Question: I'm having a sulfa drug reaction? How long till it goes away?

So i went to the doctor and she told me it was a sulfa drug reaction. How long will it last? I took about 7 or 8 sulfa drug pills before. I'm nnow taking 2 benadryl too help it. I'm about to go take a warm bath too. and i plan on drinking lots and lots of fluid... So how long do you think it will be until the rash goes away?