When did the woman go to the seaside for the last time?

M: When did you last go to the seaside?
W: Last July. We spent all our days on the beach.
M: Did you have a good time there?
W: Yes. We swam and dived off the rocks into the sea. We also played game on the sand.
M: The summer vacation is coming. Will yon go there this year?
W: Fm afraid I won’t. My father will go to Guangzhou on business next week. He won’t back until September.
M: What a pity! How long can you hold your breath under the water?
W: I don’t know. Perhaps more than one minute.
M: That’s wonderful. Let us go swimming tomorrow in the river. Is that right?