What time will the app allow me to modify a lightning Lane to a second tier 1 ride. Waiting to get into the park. Is it at 8:30am for early entry or 9am for regular park open? Just tried a bit ago at 7:45am and it won't let me yet. Thanks.
You can hold a max of only 3 MP at a time. You need to tap in and use one to open up a spot for another.
You mention modify above. You can modify, prior to park opening, but only your tier 1 to another tier 1, or your tier 2s to another tier 2. But once you tap into your first MP attraction, you then can book any tier/any park (with hopper), holding a max of 3 at a time, based on availability.