If you are never going to BJJ, then why would you be worrying about a logbook of your rolling time?
You should ask the same for yourself. It doesn't matter as long as you spend 30 minutes rolling right
By your standards the instruction and drilling don't count. Only the rolling. So if I study Youtube for 2 hrs a day then go to a gym and roll then thats (according to you) equal your instruction + drilling + rolling. See why that doesn't make sense?
You did say only rolling counts right? Did I misunderstand you?