Time in the saddle required

I know the Dirtworks isn't until May but as it will be my first 100km event I think I better work out some sort of plan . Xmas hasn't been kind and I have added about 4kgs that needs to go plus some. Well, as work finished early today I dusted of the road bike to go for a spin. Bl@@dy hell, not having it out since the Gong ride proved painful. I'm definitely going to need to spend more time in the saddle if I'm going to have any chance of finishing with a decent time.

Below is today's profile and I did it without stops which was a killer.

http://trail.motionbased.com/trail/activity/7469395