There is no limit on the number of times.
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McDonald's coffee is available all day and can be refilled free of charge.
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Especially during the breakfast period, from 5 a.m. to 10:30 a.m. (I don't know if there is any change at this time), refills will be placed on the counter. There are two POTS on the top, the red one is boiling water, the black one is coffee, and the sugar and milk are placed in the right amount.
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Generally speaking, you can go there directly during the breakfast period to refill your cup, of course, if you must ask the waiter to help you refill your cup, it is no problem.
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You'll have to ask the waiter for refills at other times.