How long does it take to get from Northampton to Leeds?

Straght up the M 1, you should be in Leeds AH now...it depends on which day and what time First thing in a morning 3 hours, mid day 2 hours, 4-5 pm Mon to Thurs. 3 hours Friday tea time 5 hours. Week end and nights after 11pm 2 hours, but I would do at least 70 mph on the motorway or it will take another hour at least, any time of day, or night