2000 Nissan Maxima SE 3.0L. Cranks and won't start. At times it will take 10 min

What is your question?

At times it will start run for 45 min. Turn the car off & might get lucky that it starts up. The longest that it didn't start up was 1 1/2 days.

What makes this problem better or worse?

It depends.

How long has your 2000 Nissan Maxima had this problem?

2 1/2 weeks