40 very small houses.
I have a council round where i can do 50 in 8 good hours, but they are small!! Semi detatched, probably about 25 in 8 hours....trad that is!!
you wanna be doing 3 semis an hr at least so thats 24 in 8 hours, but can do about 3 an a bit, with pole id imagine in 8 hours you would do more, or just finish early
40 semis though would be some going, and if they were priced right !! Your talking 300+ day!! Doubt it though as sole trader, maybe with someone though who was quick!