NIGMS limits the length of most of its R01 grants to 4 years. However, 5-year R01 grants are made to most new and early stage investigators to provide extra time for getting their projects under way, and to MERIT (R37) awardees for their initial project period.
NIGMS is exploring pilot initiatives for a 5-year Maximizing Investigators' Research Award (R35) for established and new/early stage investigators.
Other exceptions include program projects and centers, which generally are funded for 5 years. NIGMS rarely participates in short-term mechanisms (such as the R21).