My view is that top players need no time to bed in.
As Sir Matt Busby once famously said "If they a good enough, they are old Enough".
Giggs, Scholes, Beckham - didn't need that much time to bed in. Rooney started life at OT with a Champions League hat-trick. Ronaldo took two seasons to mature into a better player and reach double figures.
It's Nani's 3rd season - and he still performs as he did when he first joined. With just 12 goals in 84 games - 5 in the League and 0 goals in the Champions League. - He is simply not delivering... and we will be saying the same this time next year if he is still with us.
Im not bashing Nani - just stating that facts.