XF 1.5 Increasing Online Status Timeout (minutes) more than 60 minutes

[XYZ500]

After searching for hours and hours, I don't think there's any addon available to do this. So is there any other way? I came across this thread: https://xenforo.com/community/threads/how-to-set-the-default-time-for-users-to-stay-logged-in.20019/ but it's very old and I don't know if that works and I want to make sure that it does before messing with the files. Or maybe there's an easier way now to do this? Help would be greatly appreciated.