I lost my Learners Log Book an I have already done a 25 Hours. In a month I can be able to sit for a Hazard Perception Test to get my Provisional license, But in order to do that I have to bring my Log book with me which is I couldn't find, I can't remember whre was the last time I held it I've been looking for 2 hours now, I couldn't find it.

What should I do if I permanently lost it!

Do it over.

Go to the DMV and see if they have any extras and then try write in times... if you know you have 25 hours then just write in 25 hours