Painting more quickly!

I've made a painting box and some boards with the intent to paint 'plein air' or at least more quickly and freely.
The picture below was after 1hr 30min, painting onto a prepared board (you can see the orange surface in places.

The scene is one of the Swiss lakes with the mountains in the background.

This is an oil painting on board.

The box is quite rough, made from bits of timber and ply I had lying around in my workshop. The pallet has a glass top to ease cleaning.