I know they say 90 days is when the reboot should be finished, but how long until you start seeing a change?
I have not masturbated for several weeks. I woke this morning with a woody. Is this the start of my reboot?
I'd say 14 days as a rule of thumb. That's is usually when your start to feel a decrease in your need to fap/PMO. ... And about a week later you might feel or become aware of a stronger emotional fundament in your life!
It's different for everybody, but you should at least notice some subtle changes after a month. I'm at 19 and see some little stuff happening. It all has to do with your degree of addiction, for how long etc.