A half hour wasn't long at all. Martha could manage that, especially if they were going to do it as the sun set. Then, if it turned out she didn't react well to it for some reason, she could always go and sleep it off. Martha didn't think Blake would offer up something that would do any kind of damage, though.

Granted, she was still skeptical. Communicating across realms? All from drinking tea? It sounded mad, but Martha had become more open-minded ever since her travels with the Doctor, and she was more or less of the opinion that she would try anything once. There were probably a few exceptions to that, but this wasn't one of them.

She shifted her weight from one leg to the other before letting out a sigh and nodding. "Right. I don't know about projecting or communication through realms or anything like that, really, but I suppose there's only one way to find out." She made a mental note about the water, figuring that Blake would bring the rest. "I'll... meet up with you tonight, then?" This was probably a bad idea, but he seemed too eager about it for her to refuse.