Hi,

I'm planning to run a large experiment with roughly 700 responses (in each group, 3 players need to play at the same time). To find enough people, I'm also planning to use the Prolific platform. I believe I have set up the appropriate connection between Prolific and oTree using the oTree HR method. What I noticed is that oTree HR will ask for a specific session code to connect. I'm also using Heroku to deploy my experiment. However, whenever I clicked "open app" on Heroku and created a new session, the session I just created will usually disappear after several hours. 

So, how can I make sure my sessions stay there longer? My hope is that I can keep a session active for long enough for me to collect 700 responses. Or, should I set up multiple sessions in which fewer players (and therefore possibly less time) are needed for each session?

Any helps will be appreciated.

Thanks!

Sessions should not disappear unless you delete the database or change the type of the database (e.g. from mini to standard) via Heroku.

Do you create Demo-Sessions, or do you create sessions via the Sessions page?

Hi Daniel,

Thanks for your reply. I think I have figured out why: I was using Heroku Eco Dyno in my experiment, and it has an "auto-sleeping" mechanism that causes it to sleep if being inactive for some time. I have changed it to the basic Dyno and created a session via a room. I think that solved the problem.