Ifyou'renotwatchingandinteractingwithnativespeakers, it's goingtotake a lotlonger.
I recommendsurroundingyourselfwithEnglishsothatyoucancombinethesetwoideas.
Naturalmaterialasmuchaspossible.
Unfortunately, there's nomagicnumber.
Threehours a day.
Fourmonthsyouwillbecomefluent.
There's nomagicnumber, but I recommendcombiningthesetwoideas: realizethattimeisvaluable, timeisreallyimportant, andthematerialyou'reusingisalsoimportant.