Roughly how many miles should you expect to walk?

I agree with Kevin Brown's estimates. We usually park in the lot of the Tanger Family Gardens across the street and visit both. The Bog is essentially an extension of the Tanger Gardens; both are wonderful!

Parking is the biggest challenge. The actual park distance could be done in a mile, or a little more depending on the paths you take. If you find parking close then you are lucky. We walked an extra mile combined to start the walk