I was involuntarily forced to stop twice, once due to my monthly hormone shipment being late in the mail by a week, and once due to having a car crash which stranded me two hours from home with no backup hormone supply for three days straight.
Having had it done for me twice, and knowing how it makes me instantly feel like complete and total s***, I more or less never thought of stopping on my own, because I know that I'd instantly spiral right back into depression if I did.
Even during the points where I doubted if transition as a whole was right for me or not, and even if I decided for some reason to detransition socially, I'd probably still stay on hormones. I simply can't imagine ever having testosterone in my system again.