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Nope. It means "run every 4 hours in the range from 0 to 20. An excerpt from man 5 crontab explaining it all:
Ranges of numbers are allowed. Ranges are two numbers separated with a hyphen. The specified range
is inclusive. For example, 8-11 for an "hours" entry specifies execution at hours 8, 9, 10 and 11.
Lists are allowed. A list is a set of numbers (or ranges) separated by commas. Examples: "1,2,5,9",
Step values can be used in conjunction with ranges. Following a range with "<number>" specifies
skips of the numberís value through the range. For example, "0-23/2" can be used in the hours field
to specify command execution every other hour (the alternative in the V7 standard is
"0,2,4,6,8,10,12,14,16,18,20,22"). Steps are also permitted after an asterisk, so if you want to say
"every two hours", just use "*/2".