Rookie SW help

OK, so I'm a freshy guy. My brother has a 30 gal SW with a morray eel, ungulated trigger, and a grouper. He had to leave unexpectedly and asked me to feed his fish. Problem is I don't have a key yet, he is sending it in the mail. How long can these guys go without food? I know my fish can go a few days, and I would like to assume that is true for salties. If that is not the case he may be getting a window replaced, as I do not want to starve the poor things. Any advice?

OK, so I didn't get a response, but a bedroom window was open, and the neighbor helped me up to it. Fish are fed and all is well.

They are all very small (1"-3"), and get traded back or given to our sister with a 200 gal reef. He has pre-made bags of frozen food, and will only be gone for a week. I think he just did a big clean a few days ago, but I'll ask him what his schedule for that is. Thanks for your input.