The phrase "projection period" refers to a specified time frame in which future events or trends are estimated or predicted based on existing data and analysis. Full definition
That's the 10 - year projection period CBO published in the 2001 report linked above. (businessinsider.com)
By 2022 the ACA is projected to reduce the number of uninsured people by thirty million, add approximately 0.1 percentage points to average annual health spending growth over the full projection period, and increase cumulative health spending by $ 621 billion. (sciencedaily.com)
One dynamically downscaled IPCC simulation (WRF - MPI - ECHAM5) has a robust representation of Pacific sea surface temperature variability in the future projection period up to 2040, but the relationship to enhancement of precipitation extremes is not as clear as in observations. (usclivar.org)