Question: How will a Musafir make his Qadha of those Salat (while he was on a journey) when he returns home?
Answer: If the entire time of a Salat passed and he was still a Musafir, then he will have to make the Qadha of two rakaats. And if he returned home and had that amount of time left where he could have made the Tahreema, then he will have to perform the full four rakaats. (This law refers to only the 4 rakaats salaat).
(Tahtawi, Pg.233 / Shami, Pg.131, Vol.2)
And Allah Knows Best
Mufti Waseem Khan