If you take 8 hours sleep per night I really can't see you making the 90-hour time cut. Even if you take three nights sleep (assuming no need for sleep on the first night as it starts in the evening) you are taking 24 hours out of your 90 hours.
In context, in 2007, I was in the 90 hour group starting on Monday evening but finished in exactly 84 hours on Friday morning having just 4.5 hours sleep spread over the four nights I was on the road.
https://www.bikeforums.net/long-dist...l#post21296868