How many units do you guys take per quarter?

Hey guys,
I’m a finance major coming in fall 2017. I’ll have around 80 units transferred in, so I’ll be pre-junior status, and I will need to complete around 100 more. I wanted to ask, how many units do most of you guys take per quarter? I will probably be doing work study or a part time job of 16-20 hours a week, so I don’t think I’d physically have more time than to take 4 classes + maybe a 1 unit voice /choir course each quarter.
But how much do you normally take? It’s 20 units max without paying extra tuition as far as I know.

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