Timelines vary greatly for creating a plan depending on the writer's experience, the business type, the detail required, and how much industry and market research is necessary. There may also be other factors. In most cases, however, a detailed plan can be created within 2ι weeks.
Business Plan Duration: While writing a business plan you should keep that in mind, how long your business plan can survive? For that you have to do market research about the business you are going to start, it pros and cons. The success of your business can tell you how long your strategy will work? Flexibility: Your business plan must be flexible, if things doesn't workout according to the plan than what will be your next step? Most of the people got stuck in the situation where they don't have enough flexibility in there business plan. So your business plan must be flexible enough so that you can make changes according to the twist and turn in the market.