You should allow yourself a couple of months to write the plan, even if it's only a few pages long. Developing the plan is the "heavy lifting" of marketing. While executing the plan has its challenges, deciding what to do and how to do it is marketing's greatest challenge. Most marketing plans kick off with the first of the year or with the opening of your fiscal year if it's different.
The benefits of Marketing Plan, including: to achieve better coordination of activities. To identify expected developments. To improve the organization's readiness to change. To minimize the irrational response to unexpected responses. To reduce conflicts about how organizations should move. To improve communication. To urge management to think systematically. To expand the adjustment of existing resources to elicit preferred opportunities.