The maximum activation time must not exceed 0.4 seconds. Cleanup costs may exceed $1.2 billion. Typically, temperatures neither exceed nor drop below . On average, 8.7 days exceed annually. However, temperatures frequently exceed and occasionally reach . Individual products may still exceed advertised performance. Typically, the clearance tolerance for the ball must not exceed . This period should not exceed three years. Temperatures only occasionally exceed or fall below . Typical duration does not normally exceed 15 minutes. Generally, the contribution cannot exceed your earned income for the year in question. For this reason, efficiency can exceed 90%. In partnerships, foreign involvement cannot exceed 25 percent. The number, however, may exceed 100. Efficiencies may not exceed 100%, e.g., for a perpetual motion machine.