I think it's literally the same day. Mao put out the laundry, got threatened, it began raining, then Mao had to throw away the laundry and then the rest of this chapter progressed. Rennosuke finished the previous chapter by noting Mao hadn't dropped by much that day just as it started to rain.So how much time has passed? Has Rennosuke done nothing about his maid just up and dissapraring to work for his sister? Not a question, not a conversation? Nothing?