How long has it been since

 

The Big Bang Theory (2007) - S12E10 The VCR Illumination 

How long has it been since you've seen it?

 

Friends - The One That Could Have Been: Part 1 [S06E15]

How long has it been since you've had ?

 

 

How long has it been since: ~이후로 얼마나 됐지?