no hard-and-fast rule

No rule that is clearly defined and strictly enforced. There's no hard-and-fast rule about when you need to start or end your workday here—as long as you log 40 hours each week.

See also: no, rule

See also:

hard-and-fast rule
rule with a velvet glove
rule of thumb
a rule of thumb
be the exception that proves the rule
exception
rule the school
unwritten
unwritten law
unwritten rule

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