In my opinion, a binge would be masturbating to porn several times a day for several days.
Let's say you slipped up and masturbated to porn on Monday night. Then you do the same on Tuesday. Perhaps you can resist the urge on Wednesday, but masturbate to porn on Thursday and Friday, and so on, for me, that's a binge.
I also think that if you really have to slip up to porn it should be five minutes to get he job down and then get out of there. Obviously, this is still a relapse, but I think raising levels of dopamine for extended periods of time is the real killer.
I advise against all porn, and if possible, masturbation during the reboot process.
In my experience, when I've relapsed in the past, it meant I watched porn and masturbated for at least a week. This has really slowed the healing process for me.