Conversion of mt5 to mt4, How much does it cost and how long?

How much is it to convert 600 lines of code as expert advisor to mt4. I would like to find out how much a developer would charge also how long it would take to convert the bot from one language to another. Check for bugs and handover for demonstration etc. Please reach out and let me know as soon as possible. Expert advisor needing conversion and enhancement if any...