Hi! Please check the program solicitation regarding the anticipated award date. It is usually listed in the announcement. Based on information from NSF’s website:
NSF strives to be able to tell applicants whether their proposals have been declined or recommended for funding within six months. Large or particularly complex proposals or proposals from new awardees may require additional review and processing time. The time interval begins on the deadline or target date, or receipt date, whichever is later. The interval ends when the Division Director acts upon the Program Officer’s recommendation.
Hope this helps!
