he is a great manager he had a lot of achievement and he only needs time and some luck because the whole season they weren't lucky enough and they have unstability in their defense so he needs more time to make improvements for the club.
Mourinho doesnt need anymore time for that because it has been almost 6 months since he lead manchester united and of course that is quite a long time for him to get to know the squad. The problem is also with their defenders, daley blind just cant be their defender as he is not fit for that position