I'm on this Sunday, so I tracked down the attending, just to check what time he would be coming in. The typical thing on weekend shifts is you come in around 8 or 8:30, leisurely round on the patients, and are home by lunchtime.
"Hey, I'm on with you this Sunday. Just wanted to check the plan."
"Great. I get in around 4, so if you could pre-round before then, we can quickly go through the patients, and be out of there in a few hours."
"4 in the afternoon?"
"Oh. With other attendings, it's been more like 8 or 9."
"Yeah, I like to have most of my day free. I guess we can say 4:30, if you really want to sleep in."
"You must be a morning person."
"People tell me that, yeah. I don't really sleep."
"Okay. It's not daylight savings time this weekend, or anything like that, is it?"
"I don't think so."
"Okay. So... 4:30...?"
"Yeah, and if you could pre-round by then, that would be great. See you on Sunday!"