I've seen guys referring to "using the long set one". I'm assuming its the 30 min set one? or is there one that is longer?

They make a 5min one so I think you have the one you want.

I've seen guys referring to "using the long set one". I'm assuming its the 30 min set one? or is there one that is longer?

It is the 30 minute epoxy. However you will not get 30 minutes working time.

Yes, there are epoxies that take longer to harden than 30 min epoxy like Devcon Two Ton.  There are "table top" aka "pour-on" epoxies like Envirotex Lite and rod guide epoxies like Flexcoat.  You have about 3 minutes of brush time with Devcon Two Ton - enough time to do 2 average size bass baits.  Devcon will get hard to brush after that but will sag after application unless you rotate the bait for about 45 minutes (room temperature).  The downside of slower setting epoxies like Envirotex is that while you have much longer brush time, you also have to use a much longer rotation time to keep the epoxy from sagging - maybe as long as a couple of hours.  Most guys who use epoxy on baits build themselves a bait rotator of some kind.

 

"30 minutes" is the time you have to join the pieces of whatever you are gluing together with the epoxy - after which it will have hardened too much to form a glue bond.  It has nothing to do with using epoxy as a topcoat.  We epoxy users just "appropriated" 30 min epoxy due to its clarity, leveling characteristics, and toughness.

 

Envirotex Lite and Flexcoat contain solvent that slows the initial hardening.  It also makes for a thinner coating when brushed on a lure.  Devcon and other "30 min" epoxies are popular among bait builders because they offer reasonable brush time plus reasonably short rotation time, plus good performance as a topcoat. 

You really don't have to get the double tube push applicator thing either. I have yet to mess it up just pouring each separate.