Why not start your plan after say an hour for SOTMK?
That would make more sense anyway.
Although you can usually choose which Land to start in (the first portal,is always the one near the Fire Station, it then sends you to the first Land), it isn’t always possible to get your choice if it’s already full.
And once you’ve played the first Land, the next one is randomly selected.
Depending on how many Lands you want to play, set aside some time with a “break” and then start a plan.
The first time we played it, we started in Main St, then Adventureland. That took us over an hour, probably closer to 90 minutes; the queues at the portals were usually about 6-10 people. We finished level one a couple of days later which was a little less busy.
If the lines aren’t long, you can do a Land in around 20 minutes. BUT that also depends on how much you guide them. You don’t go from the first portal to the next one distance-wise, you get sent back and forth within each Land. So if your child(ren) insist on doing it themselves and just randomly try every portal they see, every time, you can be there a looooong time.
Been there, got the tee shirt. After a while he got a little fed up and was happy for me to “suggest” where the next one was (“look, it’s an inside one, in a Tavern - oh look, there’s a tavern”)!