Hi I am flying in from LHR-ORD.My flight lands at T5 at 3pm

1-Is that a busy time or a low tide time? I have a 1.5 hour domestic connection, so I am just wondering whether it would be enough?

2-Once you deplane what is the route to Immigration?. Is it a straight walk or do you have to walk a lot or climb up or down any level ?

Thanks you guys