Two different questions are included under the "When?" heading.
The first is related to the scope of the plan. What is the time frame that the plan will address? Because trees are relatively long lived and tree growth can be relatively slow, overall planning horizons of at least 20 to 50 years are reasonable with respect to the overall plan goals. More detailed operational plans may have much shorter planning horizons (typically 5 to 10 years), but it is important to consider these shorter plans within the context of broader, longer-term strategic goals and objectives. Furthermore, plans are normally reviewed and updated on much shorter time frames than their nominal planning horizon. You shouldn't expect that a 50 year plan will remain in place and static for the next half century.
The second "when" question relates to the development of the plan itself: when will the plan be completed and ready for implementation? Especially for city and county plans, the timetable for plan development may need to be spread out to allow time for data and input from staff members that have other competing priorities. Scheduling of meetings and hearings may also have long lead times that need to be considered in developing the timeline.
Work plan
Example worksheet for the timeframe for developing the plan - add lines to this template as needed to include additional tasks or subtasks.
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Outline
What planning horizons will be addressed in the UFMP itself?
What is the nominal duration of the plan (year start - year end). Note that this is not necessarily the length of time to the next review and update of the plan.
Indicate the target planning horizon(s) for the plan in years. If different short-term and long-term intervals apply to different plan components, this can be noted.