How to unlock Stitch in Disney Dreamlight Valley

Stitch, the loveable blue alien from Lilo and Stitch, has finally landed in Disney Dreamlight Valley, but it's a bit of a waiting game to unlock him. Most new characters are found in realms in the Dream Castle and will unlock after a fairly short questline. But with Stitch, you have to wait 10 real-life days before you can progress his quest after the first step...
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