Turkey weighs 20 Kg.
10Kg + half its own weight.
I think the answer might be 64 days.
But the eight workers would be leaning on their shovels blethering half the day so I think the true answer would be 32 days
Maybe 4 of them were smokers and that would cut them out altogether. If so the answer would be 16 days.
The 8 workers had to be picked up and taken home by the council lorry so a driver was needed to sit in the cab reading his paper till lousin time. (remember the scythe men) So we now have 9 men + quarter day travelling time each day. (the one man in the question lives round the corner)
This brings the answer down to about 1 day.
Moral . If you want a job done right then do it yourself
And why did they want to dig a hole anyway? The council changed its mind last week from a swimmiming pool to a wee hill