Hello,
With over 10 years of IT practice and being a Systems analyst in a University for over 3 years, I might be able to help you.
Please state where the md5 hash is from and if possible, what would be the length of the original text and what are the characters involved.
The time taken would depend on the complexity of the original text. May be decrypted in few seconds or may be in weeks.
Thanks in Advance