About staying in home country while having multiple entry visa

Aslmvalaikum all.. Am having 2yrs multiple entry visa.. Now am in my home country.. Can any one who experienced please let me know how many months we can stay here.. Because every 3 months we have to renew our visa.?so help me asap

You can stay as long as you want while the visa is valid.  The 3 months applies when you are inside Saudi and not when you are outside.