Have you got a nasty problem with your website or application?
Let me have a look.
It may be a problem I can fix in 3-5 working days.
If it is, I’ll work on your problem for maximum 3, 4 o 5 working days.
I’ll tell you in advance how many days I’ll work.
If I don’t solve the problem you pay nothing.
If it takes me a shorter time, you pay only for the time it took me.
What do you think?