Question:

In the Baitullah Shareef (Masjidul Haraam Makkah) one salah is equivalent in rewards to 100,000 salahs. If a person had missed ten or twenty years of salah, and then goes to the Baitullah for ten days and performs a salah in each time, will his twenty years of qadhaa salah be fulfilled?
Answer: حامدا ومصليا ومسلما
The person will have to make up all those salahs that he missed otherwise his responsibility will not be fulfilled.
And Allah ta’aalaa knows best.
Hazrat Mufti Ahmad Khanpuri Saheb (May Allah preserve him)
Mahmoodul Fataawaa 1/471