The planning horizon is the amount of time an organization will look into the future when preparing a strategic plan. Many commercial companies use a five-year planning horizon, but other organizations such as the Forestry Commission in the UK have to use a much longer planning horizon to form effective plans. In manufacturing, a planning horizon ...
The length of time a model or investor or plan projects into the future.
The length of time a model projects into the future. 
The length of time a model or investor or plan projects into the future.
Some period of time over which an optimisation algorithm is to be performed.