Grading rules revision in apparel tech pack

Hi! You must be experienced in apparel and Microsoft, no beginners. Lets start with 1 page. How much will you charge to revise 1 grading sheet in Microsoft XL Spreadsheets? I have a grading rules spreadsheet template for a sample size 8, I need it changed to a sample size 2 and all measurements revised correctly. I believe it should not take more than 30-40 min. to complete if you are experienced at this. I will want to check your work and if it is correct, I will give you 4 more to complete.
I will email you all files when hired.
Please give me an estimate on how long it will take you to do 1 page like example attached!! Please see example attached ~ Thank you. ~ L.