Oh boi 🙂
In England this question make not much sense unfortunately.
Two options really, you either drop the quality for the sake of progress or you not working as pay for progress. Sorry, but both doesn't work. You can pull off acceptable quality and double your progress but in my opinion it doesn't worth on the long run. The longer you have to do you get used to not aim for better quality work. Also you won't be able to raise price and get better money end of the day. In the last 5 years in London people rather pay littlebit more for quality work and avoid cheap job. Which is great result and its really a progress in construction buisiness which kick out the cowboy category finally
On the side note
If you do a 25msq bathroom for private customers, they not necessarily appreciate the fact as you done in a day as they question that you not rush their home and do bad job and get out quickly.
On the construction site they like to pay daily rate and squeeze out msq and do not care how you pull it off
Question to the progressive folks here:
How you do preparation including if you do a 20msq bathroom in a day?
Fixing wall, fixing floor, waterproofing etc?
3cm off walls, big curve etc, raising floor grout same day? No way.