Adobe Media Encoder render videos with fixed file size
Well you can select every output option for each file, selecting the first and holding shift, then clicking the last one. That way, you can change the max filesize for each file. For example, when you have a max of 12gb and must encode 173 files, the max file-size must be roughly 12000/173 mb for each one. You'd only have to calculate that once, alternatively, if you don't even want to do that, you could jam all your timelines in a new one, which you could then limit in filesize. Wouldn't recommend that though, as you'd have to slice them after rendering to get seperate files again.