It takes ages, months to dry. Unless you timber is proper dry. It will go a lot further and used engine oil is free. I've known it to be mixed with diesel too, but that was when diesel was cheap and red. Creosote, old oil and diesel, lovely. My friends Father used to do the kennels, stables, coops and pretty much everything outside. I've ruined plenty of clothes round there, my Ma used to do her nut at me.