Sara McCord at the Daily Muse has a few great tips on how to get through the all-day interview. Here's a sample:
1. Ask for a schedule, and a list of who you'll be meeting.
As McCord points out, this lets you do LinkedIn recon before the meeting, and also, hopefully, gives you some idea of how long you'll be there.
2. Remember that each mini-interview is the only interview ... from the perspective of the interviewer.
If you're meeting with a bunch of people separately instead of one big panel, you'll want to make sure that you seem engaged and focused in each segment. Make sure you tell each person how interested you are in working at the company, and that you don't appear to be checking your schedule to see how quickly you can get out of there.
3. Bring coffee.
Or candy, or snacks -- whatever you need to get through the day. McCord points out that you can get packets of instant coffee from Starbucks that you can make up with just hot water from the cooler. If you know you're not your best without caffeine or sugar, or what-have-you, make sure you have some on hand.
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