How will a Musafir make his Qadha of those Salaat (while he was on journey) when he returns home?
If the entire time of a Salaat passed and he was still a Musafir, then he will have to make the Qadha of 2 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 4 Rakaats. (This law refers to only the 4 Rakaats Salaat).
(Shaami – Vol. 2 – Pg. 131 / Tahtawi – Pg. 233).
And Allah knows best.
Mufti Waseem Khan