Most companies have 10 to 12 week internships...some are flexible. Mine wants a minimum of 10 but has no max. Depending when your school ends in the spring some companies have set start dates. So you may not start for a few weeks after your finals. How long is your summer break going to be...I think Kelloggs is 13 weeks. So 10 weeks would give you plenty of time...though a honeymoon in a week might be tough.
Also, I would not recommend working the day before your wedding...at least take a few days off. Its amazing the last minute things that come up and most likely you wont be working in the city/town you are getting married in. You definitely need to be on hand for wedding stuff.
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Kellogg Class of 2010...still active and willing to help. However, I do not do profile reviews, don't offer predictions on chances and am far to busy to review essays, so save the energy of writing me a PM seeking help for these. If I don't respond to a PM that is not one of the previously mentioned trash can destined messages, please don't take it personally I get so many messages I have a hard to responding to most. The more interesting, compelling, or humorous you message the more likely I am to respond.