Integration time (running total):
    * L 70 X 180s (210m)
    * R 60 X 180s (270m)
    * G 64 X 180s (192m)
    * B 65 X 180s (195m)
    * HA 68 X 300s (340m)
    * Total: 18h37m

Notes

Imaged over the course of three nights where the seeing was the best for several months. M81 was high in the sky thus avoiding (though no totally) the negative effect of the ever-worsening light pollution. I included a lot of time on the Hydrogen Alpha channel to enhance the star-forming regions in the spiral…