Physiotherapist Håkon Hov, encourages you not to fall into the trap of training at a low intensity because you can then train more frequently - remember that intensity trumps quantity.
Training is fresh, train hard enough
It is a well-used expression that training is fresh produce. And to a great extent it is too! During the most hectic periods, you can therefore "put the fresh produce in the freezer for a bit" and in this way safeguard its shelf life. It takes much less to maintain good form than to create good form! It depends on your starting point, but the vast majority of us manage to maintain both strength and endurance in a hectic period of two to three weeks, with one interval session and one strength session per week - As long as this is done heavy enough.