There is not a "Certain Value" that it needs to be at, but it does need to be at the actual value.
The reason TurboTax is asking is because the home office expense deduction is based on the percent of income that comes from the home office. So if you earn $20,000 and 75% of the time you are on the road and 25% of the time you are in your office, then you would only be able to deduct 25% of your home office expense of $5,000.
The number can be anywhere between 1% and 100%, it just needs to be the actual percentage.
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