There is no definite answer to your question Jim because tinnitus is complex.
First and foremost tinnitus is an integral part of our mental and emotional well-being and cannot be separated from it. I mention this a lot in my posts because it's important that a person understands this, otherwise they may find the habituation process difficult.
Life is problematic and we all have problems at one time or another. Starting at the environment in which we live and those we are close to. Moving further afield to the people we associate with at work. All this has an impact on the way we feel, positively or negatively and ultimately affect the way our tinnitus behaves. Some people with intrusive tinnitus also have additional health problems. Depending on the severity, they can affect the way we feel and again, have an impact on the tinnitus. This is the reason medication and counselling if required can help a lot, addressing other issues in one's life and have a positive impact on the tinnitus. Once stress and anxiety are managed life becomes easier and less problematic.
Sound enrichment is a good thing and I encourage its use especially at night. However, it's just one piece of the jigsaw puzzle. It is a culmination of things coming together to help an individual manage their tinnitus successfully to go on and lead a fulfilling life. I believe this is possible for most people living with this condition. It took me 4 years to habituate for the second time. I was unable to read a book for 2 years and thought my life was over. Of course I had my downtimes, many of them, but I soldiered on and eventually became the victor of my circumstances. I am a much stronger person for the experience. I still have my downtimes but when I look back and see how far I've come, I dust myself down knowing the dark clouds will soon lift and tomorrow will be a brighter day.
Michael