How many beads for a 54qt cooler?

jtree26

Young Chimp
I recently purchased a 54qt cooler and I'm getting ready to order some Heartfelt beads for it. According to Heartfelt's website 1/2lb of 65% beads is good for up to 2.5 cubic feet of space. The 54qt is approximately 1.872 cubic feet. I'm thinking that 1/2lb will be enough but I want to make sure I have enough of a buffer so the RH can recover fairly quickly after I open the lid and dig through it. Does anyone else have any experience with a cooler of this size along with beads?
 
Half a pound will be fine. And if it is one of those extreme coolers (can hold ice for 3 days or more) then you won't even need to spray but half of the beads.
 

Heartfelt Beads
540 cu inches = 1 ounce
1080 cu inches = 2 ounces
1620 cu inches = 3 ounces
2160 cu inches = 4 ounces
2700 cu inches = 5 ounces
3240 cu inches = 6 ounces
3780 cu inches = 7 ounces
4320 cu inches = 8 ounces
4860 cu inches = 9 ounces
5400 cu inches = 10 ounces
5940 cu inches = 11 ounces
6480 cu inches = 12 ounces
7020 cu inches = 13 ounces
7560 cu inches = 14 ounces
8100 cu inches = 15 ounces
8640 cu inches = 16 ounces

 
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