I have followed a similar regimen. Actually I have probably followed any kind of regimen any single person can with Ketamine.
I feel like 99.9% of people should not attempt to recreate Jamshyd's regimen, that is, small but noticeable doses 4-5x a day. Because 99.9% of people will absolutely not be able to stop themselves from making larger bumps, more frequently, and then the bumps become lines, and before you know it "hey small doses worked good bigger doses work even better!"
Ketamine addiction is a tricky bitch because you will think you're doing yourself quite the favor for a long time. You can even be absurdly addicted by anyone else's standards and still think you are on the cusp of some kind of personal/psychological breakthrough.
Most likely, that breakthrough will be temporary schizophrenia until you stop using Ketamine.
That said, my opinion is that if somebody wants to use Ketamine *seriously* for depression, and has no interest in enjoying it's pleasant buzz or drifty though process, this is the best regimen to maximize results and reduce addictive potential:
Do enough Ketamine to "K-Hole" or whatever amount you prefer, but no more than 250mg intranasally. Take an evening to enjoy it. Get the full experience.
**And do this once every 2 weeks if you are mega depressed, and more like every 4-6 weeks if it seems to be helping**
This resuts in much less consumed Ketamine. It also avoids trying to pussyfoot around proper doses, which almost nobody can resist the temptation to take when they are dosing themselves with Ketamine, especially once they become well used to snorting the stuff. And the most important part:::
You will spend most of your time as a sober human being.
Ketamine's antidepressant properties are known, and also in my own experience, to last for easily 2 weeks and often longer. There is no need to do it multiple times daily as an antidepressant unless you are just trying to prove you can walk a very dangerous line that few can tread successfully.
My 2 cents. And not a jab at Jamshyd, glad whatever you're doing works for you. But as another very experienced Ketamine user (who very rarely uses it anymore, and treat it as a very special occasion if I do) I felt it necessary to post my views.