Figure 8. Lifespan is independent of the number of subjective days lived. (A) Relationship between chronological time and perceived days for short-, normal-, and long-day flies. (B) Free running period had minimal effect on lifespan. Animals were aged under free running conditions and a comparison across genotypes was made (short period n = 237, long period n = 252, Gal4 control n = 245; P = 0.022).