Wow you sew really really fast. I would plan on a minimum of a month to do a full set of undergarments. Both corsets that I have done so far took me a month or more. True one was my very first one and the other was hemp corded but still. Your friend is really lucky!
I know the short on cash scenario though. I am cross stitching up a storm for some people so they have a hand done gift from me that didn't break my bank.