In reply to galpinos:
Unless you are very experienced then a minute or two at the start planning is seldom wasted. Or pick something that is clearly a good start point and walk to it, reading and planning the whole way there, then pick up the pace thereafter.
Know your strengths, are you a poor naver but fast to go for the outliers, or better to pick up the more technical ones. Often I might thrash it across the flat, downhill and power walk the steepest hills, as that is my thinking and map time so once it's faster ground again (for me), I'm off again.
Close to home I will identify a few that are generally low points, but I can pick up if I have time in the bank. I will aim to get back in time for them, but little is lost if I have to head straight to the finish. Also knowing roughly how far the finish is and how long to get back doesn't harm, especially if you fold the map up as you go, it's good to view the bigger picture occasionally to stay on top of things if you are working at an irregular scale.
I try to make a rough circle, but will zig zag a little left and right as I go, to fit in as many as possible. I never go for a roughly straight line out to the farthest and back. A kind of narrow triangle, I think you limit your options and shooting off side wards for extra involves a lot of extra leg work.
Practice, do some shorter normal orienteering score events. Or find some permanent orienteering courses, but treat it as a score and test yourself. It's all about planning, some basic maths etc... all whilst blowing out of your ar$e going uphill, or trying not to go tumbling down one!!
On open starts, don't forget to start your watch, a common mistake of mine where I end up estimating how long I've been going etc... it rarely ends well.
Post edited at 16:37