The idea of using the business model canvas is a great one. However, this is not an interim business plan until you are ready to write more, the business model canvas is THE business plan. Or you can go free-form and come up with your own one-page description of your business and where you're heading that makes more sense to you. Bottom line, if you cannot put your business plan on one sheet of paper, you may be confused about the direction of your business.
You do need to set aside quality time to reflect upon your business, the possible threats and opportunities you may face, and the mission and objectives of your business. The amount of time you spend depends on your attention span. Don't sit there and let the wheels spin without going anywhere. When you reach that point, get back to building revenue.
But always set aside that quality time. Use time from your most productive time of the day to reflect on your business, where it's going, and building that one-page plan for the future. That time spent will prove invaluable when you encounter an unexpected change in the market or an unexpected move by a competitor.
The purpose of the plan after all is not simply to predict where your business is going but more so to consider and help you react more quickly to a changing environment.