As mentioned above, there is no exact criteria for regular use. If you use it all year but only do billing in the office 5 days a month and don't use it any other time nor for any other thing, you can count that as regular.
Basically, if you have a business where you are out of town most days a month and the office "sits idle" waiting for you to come back to bill the customers 4 times a month and you have no other place where you do the billing, it would still be regular use.
Sitting idle does not make it not regularly use. Regular use could be more of a "routine" than a set number of days or hours per week.
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