Once you have completed the campaign mission at TerraNova HQ, you unlock a supply point at the top of the tower, which is in the middle of the map. You can fast travel back to that point called “Supply Point: TerraNova HQ Summit”.
Once you spawn there, you can run off the edge of the building, click
to engage the wingsuit and fly as far as you can before you touch down. You can almost walk away from your controller and make a sammich while you fly, as long as you don't hit a building or a map border. Once you land, go back to the closest supply point and respawn at “TerraNova HQ Summit” over and over again until you get your 30 minutes.
Here is my capture doing it.