Hajj and Umrah

am going for `Umrah, in sha’ Allah. I will be in Makkah for four days and will make `Umrah on the first day. So can I perform another three `Umrahs on the rest of the three days?

Is visiting Madinah a prerequisite for Hajj and `Umrah?

The issue of repeating Umrah more than one time in a single trip to Makkah for Hajj is lawful if it’s done from masjid `A’ishah. Sheikh ‘Abdul ‘Aziz ibn Baz was asked: If someone comes to Makkah for Hajj or ‘Umrah, then is it permissible for him after that to perform another ‘Umrah for himself

A course that runs only once a year, important to my career in my opinion, will be running at haj time. Do I still have to go to Haj this year? bearing in mind that I have enough money, health...etc