Give 2-4 hours to hike Big Schloss. If you take your time on the first mile, then stop for small breaks for views along the way, this time should be accurate. You will also gain a little over 1,000 feet in elevation. Bring lunch or snacks as well, you'll want to hang out at the top for a while. There are spectacular views of both West Virginia, and Virginia. The trail runs along both state's borders.