When the mind conjures up ‘important’ proposals, we can patiently tell the mind to listen to the mahamantra and also reassure him that after the japa session you shall certainly address the issue.
Before we sit to chant, we can resolve to chant a certain fixed number of rounds in that sitting. Say for example you resolve to chant six rounds without a break. Till the six rounds are done you should then refuse to look at the watch or put things on the planner. Whenever the mind protests, just reassure him that after the six rounds are done you shall certainly work on the concerns expressed by the mind. This way we are showing Krishna that we are valuing our session with him and are not looking to end the meeting.
HH Radhanath Swami