What is the woman most concerned about?

M: It’s going to be really hot tomorrow. Let’s go to the beach.
W: Ok. But we’ll have to leave very early or else we’ll get caught in the traffic.

M: Could we drop by the lab for a minute? I have some experiments running that I need to check on before dinner.
W: Sure. I have plenty of time. I’d be interested to see what they will do.