Cook your own: fries

DIY fries bought in the office 

Since I am fond of fries right now, I cook my own, ok, I taught my house help how to slice and deep fry potatoes. I was not able to get the desired crispiness though. My fries looked a bit soggy even though I tissue off the grease. It didn't help even if I put it inside the oven toaster  for 10 minutes when I got to the office. 

I wonder how many minutes would it take for the fries to cook and at what temperature? Can anybody help?