It is unlikely that the IRS would consider 5 hours per month to be 'regular' use to qualify as a home office space.
If the work that was done in those 5 hours per month was essentially all the work that was done for the business during the month, then you could say that it was used regularly. A situation like this could require some sort of substantiation if the IRS were to question the deduction.
If you expect the use of your home office space to increase over time as your business continues and the home office usage would become more 'regular', it could be better to wait to claim that possible deduction.
Below you will find some resources that discuss the definition of 'regular use':
What does "Regular and Exclusive Use" mean?
From TurboTax help content:
Regular Use
'Regular use' means that the part of your home used as an office must be used on a continuing basis.
If used only occasionally or incidentally for business it does not meet the test, even if the area is not used for any other purpose.
Even if you only perform administrative activities (such as billing or scheduling clients or making telephone calls), you must perform these tasks on a continuing basis. If you have another office where you also perform these tasks, you do not meet this test.
A daily log will help establish the regularity of the business use of your home office. Record visits with clients or customers, the time you spend in the office, and your business activities done there.
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