The intention of 3.5 hours seems clear that you just want people to be able to use it for only 2 collections. So, even 6 hours would make it so you could only use it for 2 collections, but it would maximize the convenience of when you do those two collections. One of my teammates tried out the aureate for the first time and somehow managed to miss the 3.5 window even with setting a timer and really trying to plan for it. It looks like the intention is to limit the benefit to two collections, but it has been done in a way that seems punitive for having other responsibilities that delay you from getting back. So, having the timer work for 6 hours would maximize convenience, but even making it 5 or 4 hours would be a good improvement.