You can book your next Genie+ after
(1) tapping into your most-recently-booked one,
(2) canceling your most-recently-booked one,
(3) when your most-recently-booked one expires, or
(4) two hours (that the park is open) after your most recent booking.
In this case, it's #3. Your 10:50 KS expires at 11:50. You can actually book sooner by tapping in or canceling it.