How much information should I include in my log book?

You need to answer fully the questions listed on the log book sheets. Try to put yourself in the position of the assessor, and ask yourself: "If this is all they see and know about me, have I given them enough information to make a good judgment?". Typically we seem to get too little information rather than too much, and then when we have to ask for more, so it just delays the process for you. So if you have any doubt, err on the side of too much information.

Have a look at the example log book entries to give you a more concrete idea.