I am going to look at this as similar to spouses with part-time work.
You calculate the expenses for each day that your spouse "worked". However, see this about expenses you have to pay a week or a month at a time.
Note that your expenses need to be prorated for the days that your spouse was actually working. That means that much of the calculation is on an annual basis, but the amounts paid must be prorated.
It appears the your understanding is correct, but review the text about part-time work in Pub 503.
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