My routing is:
Flight UA 398
Minneapolis (MSP) to Chicago (ORD)
Depart: 9:00 AM (local time)
Arrive: 10:09 AM (local time)
Seat(s): 04C

Flight UA 881
Chicago (ORD) to Tokyo (NRT)
Depart: 12:10 PM (local time)
Arrive: 4:25 PM (local time) (next day)
Seat(s): 35C

Flight UA 801
Tokyo (NRT) to Singapore (SIN)
Depart: 5:30 PM (local time) (next day)
Arrive: 11:55 PM (local time) (next day)
Seat(s): 17B

As you can see there's only 1 hour between flights at NRT. Also, what's a "Sweet Spot"? Thanks.

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Greetings from the land of 10,000+1 lakes.