I would double that, bet that takes you 8 days, i have done a few regrouts and they take ages even with a fein. Its a day rate job dont price it you will loose out.evening all, been to see a job for friend ot the family today.
2 bathrooms both bumpy whites with borders,been in around 7 years and needing to be re grouted with white grout,,also Silicon is about an inch thick round bath etc and needs replacing,
total sq meterage 44 sq metres i was thinkin g maybe 4 days to do the lot but havent done many large re grouting jobs whats your thoughts on this?
Fein with thin disc
Should have that ground out in a day, We did a 20sqm bathroom recently where the customer changed her mind on grout colour on similar sized times, Ground out by dinnertime,Cleaned and re-grouted by the end of the day
Used a bosch and sent it back, Fein all the way.If you need a lend of one drop me a PM
How old was the grout though Sim?