Since nobody opened a thread for this jet.
Swan boat race winners according to the Japanese wiki:

01 day: x20 (max bet: 100)
02 day: x30 (max bet: 100)
03 day: x10 (max bet: 100)
04 day: x100 (max bet: 100)
05 day: x20 (max bet: 100)
06 day Special race: x30 (max bet: 300)
07 day Firs half final: x20 (max bet: 300) [Special day don't forget to bet on all girls atleas 50 crystals]
08 day: x50 (max bet: 200)
09 day: x10 (max bet: 200)
10 day: x30 (max bet: 200)
11 day: x20 (max bet: 200)
12 day: x50 (max bet: 200)
13 day Special race: x100 (max bet: 300)
14 day Second half final: x30 (max bet: 300) [Special day don't forget to bet on all girls atleas 50 crystals]