If you are a demo member, here is what you can view on each site:
On Digital-Tutors: both sites' demo members will have access to select courses and free initial lessons (the first 10% of each course) throughout the library. There is no time restriction.
On Pluralsight: Digital-Tutors demo accounts will not have access to Pluralsight training until purchasing a Digital-Tutors subscription. You can explore while logged in, but will only be able to view training once you become a subscriber.