Here’s a clarified version: “If a mother tells her child, ‘You are not allowed to go out for the next two days’ on Monday, does the time of day she says this affect when the child can go out? For example, if she says it in the morning, does it mean the child cannot go out on Monday and Tuesday (the next full days), or if she says it in the evening, does it mean the child cannot go out on Tuesday and Wednesday (the following days from the evening)?” Explanation: The phrase “for the next two days” typically means a 48-hour period starting from the moment the statement is made. However, if the mother says it in the morning, the days affected are Monday and Tuesday, as she is setting a 48-hour period starting from the morning. If she says it in the evening, the 48-hour period starts from the evening, meaning the restriction would cover Tuesday and Wednesday. This phrasing removes any potential ambiguity and makes the timing clearer.

"The next two days" refers to the upcoming 48-hour period from the point of the statement, which is typically interpreted as the next two calendar days, regardless of the time of day. If a mother tells her child, "You are not allowed to go out for the next two days," the specific time of day can slightly affect the interpretation: If she says it in the morning on Monday: The child would likely be prohibited from going out for the entire day on Monday and the whole of Tuesday. The two-day restriction begins from the start of Monday. If she says it in the evening on Monday: In this case, the restriction would likely mean the child cannot go out on Tuesday and Wednesday. Since the restriction starts after the evening of Monday, it would cover Tuesday and the following day (Wednesday). In summary, the time of day can influence the interpretation of "the next two days," but in general, it’s understood to mean the entire span of the next two calendar days starting from the point the statement is made.

If I were the mother, no matter what time on Monday I imposed the punishment it would mean the whole of Tuesday and Wednesday.

It's a little ambiguous even to a native speaker, but I'd say yes, if she says it in the morning, it means the child cannot go out on Monday and Tuesday, and if she says it in the evening, it means the child cannot go out on Tuesday and Wednesday.