That really depends on the person… many people have several hours of REM each night in fairly long blocks.
I average 2.5 hours of REM/night (measured via ZEO), and apparently 2 hours/night is average for demographic of men aged 17-29 (per ZEOs user stats).
I typically have at least one solid non-fragmented hour long block, and a second block of at least 30 minutes with the remaining hour from small blocks.
That really depends on the person… many people have several hours of REM each night in fairly long blocks.
I average 2.5 hours of REM/night (measured via ZEO), and apparently 2 hours/night is average for demographic of men aged 17-29 (per ZEOs user stats).
I typically have at least one solid non-fragmented hour long block, and a second block of at least 30 minutes with the remaining hour from small blocks.