29 C.F.R. § 541.701 Customarily and regularly.
Title 29 - Labor
The phrase “customarily and regularly” means a frequency that must be greater than occasional but which, of course, may be less than constant. Tasks or work performed “customarily and regularly” includes work normally and recurrently performed every workweek; it does not include isolated or one-time tasks.
Title 29: Labor
PART 541—DEFINING AND DELIMITING THE EXEMPTIONS FOR EXECUTIVE, ADMINISTRATIVE, PROFESSIONAL, COMPUTER AND OUTSIDE SALES EMPLOYEES
Subpart H—Definitions and Miscellaneous Provisions
§ 541.701 Customarily and regularly.