I've done lots of 40 mile days in a kayak, and 20+ hour days of climbing and various ultra endurance activities and it's not 'fun' by most peoples standard but I get the attraction of seeing what you can do.
Bring back up lights, and fully charged phones, bivy gear and multiple sets of dry clothes,body glide for chafing, super glue and tape for blisters. and LOTs of snickers bars. WEAR your lifejackets as your chances of falling in will rise with low blood sugar and fatigue. Have someone on shore you can check in with and report your position, just so the SAR team knows where to start searching if you go missing.
Google earth say 112 miles in 40 hours minus 10 hours for breaks, it seems doable at 3 miles/hour. I would try and do a few 8-12 hour day trips to get an idea of your average speed over a day and help toughen your hands and dial in your boat fit and other issues that crop up after that long in a boat.
Recreational Kayak Paddle
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