Answer
Two human wives are the least. Hence, if a man had four wives, he could be reunited in Jannah with all of them, Insha Allah.
This is in the case where those wives did not remarry after his demise.
and Allah Ta’ala Knows Best
Moulana Muhammad ibn Moulana Haroon Abassommar
FACULTY OF SPECIALTY IN HADITH SCIENCES
checked & approved by: mUFTI EBRAHIM DESAI (FATWA DEPT.)