40-50hr/week part-time IBD + college. Doable?

Hey pals,

Going into Jr year, and am taking a full courseload (albeit with no problematic courses difficulty-wise). Have the opportunity for a part-time fall IBD position at a solid tier-2 investment bank (think Roths, Jefferies, HLHZ etc). They want a 40-50hrs/week commitment.

What would you do? Is the trade-off for this vs lower grades worth it in the end for SA recruiting? After all, SA apps here are due before this semester's grades are, so it shouldn't matter a ton. But 40-50hrs is what normal people call a full time job - wouldn't be easy.

Thanks!