[smarx]

Regardless of what word comes next, it should probably be "24 x 7 x 52".

[pc86]

Since a business closing does not typically occur in week-long increments, probably not. "24 x 7 x 364" is generally understood to mean one day off a year (usually Christmas Day in the US), and "24 x 7 x 51" would not be clear at all.