Losing connectivity to JupyterLab session, losing work

Hello, all.

It’s been a while since I’ve been here, but one of my users is facing an issue that I haven’t been able to figure out. He is running JupyterLab as an interactive app within Open OnDemand (v1.7.0). He is apparently leaving it to run his computations, but when he comes back to it a couple of hours later, his session has been disconnected, and when he attempts to reconnect, he has lost his work and must start over. Is there anything that can be done to permit him to reconnect to JupyterLab and continue where he left off? Or, alternatively, is there a way to extend the amount of time he can remain connected to the app while it completes his calculations?