When you book a house sitter, what does that include?

Hi, I'm new to rover and trying to figure out each service. I'm planning a weekend out of town and am wondering, if I book a house sitter, will that be enough for 3 days? Are they just there over night, do they leave during the day/for how long? Should I also book drop in visits during the day? I'm having a hard time seeing what exactly they provide with the house sitting service.