If youv'e never done it before, 2 days would be about right.
Assuming that the builders have left things reasonably tidy ?? clean your internal glass first.
Then starting upstairs,1 room a ta time, scrape 'snots off floor, vacuum all surfaces.
Using a trigger spray and cloths, wipe clean all fittings i.e radiators, light switches, doors etc
Really make an effort in bathrooms and the kitchen, make 'em shine !!!
Check for dust and debris in every nook and cranny!! on top of cupboards, behind toilet pans, taps and in behind boilers etc.
Finally... weather permitting, clean the external glass, and wipe clean, if safely accessible, down pipes/gutters/ meter boxes etc.
Iknow I havent said it al, but there is a lot to learn !!!!!
Good luck