Thanks for the question! We wanted to talk about Dynalist here in this forum, but I guess we're part of Dynalist too... oh well.
@Shida seems a little busy at the moment, so I'll go first. We started Dynalist ("Omniflow" back then) around March 2015, originally like a fun side project. We've done this kind of projects several times, and Omniflow was no different. We were still attending school at that time. (Our about page covered why we started Omniflow)
About two months later, we got a rough prototype and we started using it ourselves. It was pretty satisfying and so we wanted to put it out there so more people can use it. In May, we went down to San Francisco for internships, and we almost forgot about Omniflow. One day we thought to ourselves, if we continue to not work on Omniflow, it would just get nowhere like our previous side projects, so we tried submitting to Hacker News and got on the front page (link) briefly. The only thing that didn't go well is that we told a friend to come check it out (who actually was using Omniflow at that time), and he left a good "review", probably because he hasn't used HN. That left a bad taste for some people...
After that, someone submitted Omniflow to Product Hunt and we got on Top 10 (I remember we were exactly No. 10, lucky!). That was back when PH wasn't so crowded like it is today. We got a bunch of users from these two sources, which verified that there actually exist people who would want to use Omniflow!
So we worked on it some more during that summer internship, adding LaTeX and a bunch of polishes. Around July, we changed our name from Omniflow to Dynalist, due to potential legal reasons ("the Omni Group"). Starting from there, we kept working on Dynalist more and more, until it becomes what it is today. Up till now, we threw in around 6 months of full time and the rest are all part-time as students.
It's hard to say how much time, since we never clocked the time we put in. I'd say around 30 hours a week when full time. When we have classes, it really depends on the schedule of assignments due and midterms .
When I'm not working... just like any other 23 year old I guess. I watch Game of Thrones and now Westworld. I read Hacker News and reddit everyday. Oh and we try to get enough sleep!
That's about it! Excited to see what @Shida has to say (I might have stolen most of his lines ).
Bonus (some screenshots from early Omniflow/Dynalist):
Evolution of our landing page:
It was indeed a fun journey!