Best chain and Timbersled, camso chain lengths???

I carry a complete spare chain for the primary drive on my Yeti. Last year we saw a chain on a Yeti and a chain on a Camso come apart. Since I am demoting my current chain to a spare I was thinking of throwing in a few extra master links so that it could easily be broken down to replace any of the three brands(timbersled, yeti and camso) whether it be primary drive or secondary drive on the timber and camso. Anybody know the most common amount of links for the primary drive and the amount on the secondary drive? I believe camso hasn't changed their drive over the last couple years but is the Aro secondary different than previous mountain horse years? Would like to make this chain cover almost any scenario. If i'm gonna be packing the thing anyways it would be great to be able to help anybody out on the hill.

Also, how many hrs are guys getting out of their changes and what are the most bomb proof replacements?

Have a 2015 Timbersled ST 120 since new. Still on original primary and secondary chains with hundreds of hours.
Timbersled uses EK branded chains and have had with little issues. Not sure if they are still using after the Polaris buyout.
The secret is keeping them lubed and snug. I have only used Chain Wax branded lube with success, applied often, especially on primary, as it is running in the open.
I believe 52 links and 54 links are the common lengths for secondary drive.
Primary drives lengths are more likely bike specific.

Can you remember if the Yeti and Camso chains broke at the Joining link or randomly on the chain. I never thought about it at the time. Dam good idea to be able to fix just about anything though.