I have been finding that I get logged out of ArcGIS Online (and the community site as well) every day after a certain number of hours. Typically my day starts at 7am and I often work until 4ish. But I find myself having to relog into AGOL it seems between about 2:30 and 3:30 in the afternoon. I don't think this is a browser setting or a organizational network thing as I'm often signed in to other sites for the same period of time, and I haven't noticed being booted out of Pro while logged into the same portal (AGOL). Is this a setting in AGOL that can be changed or is it not even AGOL related possibly?
Edit: meant to include that I am using Chrome which I believe is hardened by our IT, haven't experimented with the MS Edge or others at this point.