depends on the day on my mood etc..
if you sometimes don't feel like doing your gratitude habit you can just spend only 1mn on writing the first three things that cones to you mind.
fast, like to make a to do list.
be it writing in a journal
Or closing your eyes and thanking those things that come into your mind which you think to deserve appreciation or be it performing prayer for all those things that you have received or earned.
Cause more often than not we are oblivious to a lot of things that we have this very moment.
Sound health, all your Limbs, Eyes, nose mouth, a beating heart, world's most evolved piece of machinery: our brain, a loving family, your job or bushings so you get the idea.
In all honesty, I don't want to brother myself
with what scientific journals have to say about how gratitude will help me, its basic common sense that if we learn to appreciate what we have at this moment from the core of our being it's logical to presume that if that dream that we are struggling to make it a reality every day has come true we would be able to appreciate it!
Wealth money healthy situation
Few good and reliable friends
At the beginning it was difficult because I wasn't used to thinking in that way so my psychologist proposed to push myself to write at least 2 things per night. That helped kick off my mind I guess.
Another thing that helped me was to find another reason to write positive things. "gratitude" sounded too vague for me so I started thinking about what nice things happened during the day like having a nice meal or talkng with someone I care for. Or what do I find particularly nice about my life, things I'm lucky to have like being able to stay at home during quarantine. I know that's basically the same as gratitude but rephrasing the question helped me make it more personal.
A tip, sometimes I just fill in things that might sound cliché like having a roof over my head. It sounds weird in my head but once it is on paper I realized that it's actually a real reason to be grateful for.