I would think most people would probably check-in on Sat. or Sun. if staying for an entire week but lots of people drive and don't arrive until Mon. if traveling on a wknd or maybe check in on Fri. night as to have the full weekend in so I'm sure it is very varried.
I do know though that for DVC - the biggest check in day would be Sunday as points are lower Sun.-Thurs. Vs. them being higher on Fri. & Sat.. But that is only DVC not all of the regular WDW resorts.
Official check in time is 3pm at the regular WDW's and 4pm at the DVC's but lots of people check in as soon as they arrive during any day and if the rooms are ready - they're in
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