Take 2 MBA courses a semester. Each course will teach you a lot you probably don't already know, and you can use that stuff instantly, so it's not like it's useless until you graduate.
It's actually not that hard if you're only hitting 2 courses per semester. And it sounds like you might at some point want to get your MBA anyways.
If you don't want to go for the MBA, though, it does look like there's a lot of potential in the OH&S job market.
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