Does anyone know how big Disneyland is? How long does it take to walk from one end to the next?

Depends on the crowds of course, and how many shops you stop in. This was in the new Ap newsletter:

Go The Distance!
• Disneyland® Park Main Entrance to
Mickey’s Toontown = 2,160 feet or 860 steps
• Splash Mountain to Space Mountain = 2,300 feet
or 920 steps
• Disney’s California Adventure® Park Main Entrance
to California Screamin’ = 1,880 feet or 750 steps
• Mickey & Friends Parking Structure to Disneyland®
Park Main Entrance = 3,770 feet or 1500 steps

This is from MouseSavers...

"Disneyland is roughly 1 square mile in size."

Number of steps I guess depends on which route you take...