On ours it's the same thing: You've just added time, i.e. told it to go for thirty seconds or three minutes or whatever, so it starts doing that. Feels quite obvious and intuitive to me.
"What, you didn't mean tomorrow or next week, did you? I'm not one of those fancy models with a totally unnecessary timer, you know, so I'll just assume when you tell me to do something, you mean do it NOW, like any sane person (or appliance) would", I can imagine it saying.
