What would you guys charge for storyboards?

I'm working for someone as a line artist, and recently their previous artist, who did the storyboards, dipped, and they asked me if I could do a couple of pages to help get back on track with the line art.

The storyboard quality they are looking for would be stuff thats ready for inking (not the usual blob people I draw for my own storyboards lol)

I'm not super good at making storyboards for others, and this would be my first time (they also provided 3d models to help me understand what I'll need to draw). How much should I charge for each page? I'm not exactly sure how long it will take to draw all 3, but if I'm feeling hyped up, it shouldn't take too long.