Loot Bonus & Chests Questions

So we all know that the longer a chest remains unopened, and the more loot bonus you have, the more loot it spawns.
- What is the rate at which items are increasing? Like, is it a set amount? I don't know how the bonus items and the chest time would be scaled
- Do you get the +loot bonus % effects from an item that you are holding if you don't meet the requirements of that item? Theoretically, the answer should be no, but I found something interesting. If you use war scream with a spear you own (or arrow shield for archer), and then quickly switch to a different weapon (ANY weapon, it doesn't have to be a weapon you meet the requirements of, and it can even be from a different class if you used war scream), the damage output will scale to that of the weapon you switched to. This got me thinking; is it possible to do a similar thing for loot bonus on chests?