How long to change a turbo on a 1.6

[geoff]

Pondering !!!!!!   .......  I've been offered a 1.6 HDi  92 in very nice condition, 70 k and '07 plate 

Amongst other things how long does it take to change a turbo ?  

The car is advertised as " turbo gone " purely because the engine makes no power ........... but there is no smoke and engine is smooth running and quiet ...... runs but is limited to 45 mph.

I'm wondering if the turbo is ok but no boost due to other reasons , solenoid valve, vacuum pipes etc.

Would 45 mph max be typical speed of no boost ?

I've not viewed it yet as not local to me but am sorely tempted as price is good and after haggling will probably be £600

I'm capable of doing most any works so not frightened off in that way.

Thoughts and advice welcomed.