if i am intrested about the long subject i will read about it....
but sometimes the way of present the subject is boring...then ill take the outlines or the paragraph i think ill interested in... but the most important thing is to read the subject when you are ready to read and have enough time in order to give your concentration to the subject... somtimes "bekoon al wa7ad mish ja3balo yekra2" then it is better to delay reading it.....