I know this is a bit of an obvious point, but there's something a little frustrating about this thread - if you're buying a camera for a run and gun project, can I suggest not getting ANY stills camera, period. The A7RII is a STILLS camera, not a video camera. When Canon started this movement it was for people like journalists who needed video no matter what and happened to be holding something with a nice sensor. If you intend on using it as a full rig, then it should be bought with external gear anyway, thus fixing the problem. I'd be much more worried if this overheating issue applied to still photography on the other hand....does it?
Well I can't tell you how much is too much since each one has its own thresholds. Head over to the dpreview forums, there are plenty of examples so you can see if you can handle it.
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