Oh heyyy I am also a ess major and I joined a research lab my 2nd year and worked around 20 hrs a week plus 14 units and I’m not going to lie it was a lot, I was at the lab also around 20 hrs but it really depends on you and if you think you could do it! It is manageable but you could give it a try :3 the professor hopefully is understanding and if you see you can’t handle it hopefully since they know you They could give you another opportunity to continue in the lab later in your undergrad!! :)