<p>You can register for up to 20 units without approval, however you will have to pay for any extra units past 18. With approval it is possible to take more than 20, my friend did BS/MS in civil engineering in 4 years while routinely taking semesters of ~22 +/-2 units (I forget the actual number, its been awhile).</p>
<p>However I can’t say that will be as easy as it sounds. As stated above, you will have to look into planning a minor out ahead of time as with more required classes comes less flexibility. Also, you should look into what summer classes are actually offered because the course selection is much more limited during summer.</p>