[okayama]

1st scramble: B2 L F2 L' U2 L B2 D2 F2 D2 L U' F R F' D' R' U' B2 U2 R'
1st solution (1-hour): R D B R F' R' B' R F2 D' F' R2 B' D B F L F U B2 U2 R2 F2 U (24 moves)

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15 min solution.

(Inverse)
Pre-scramble: R'

1st square: U' F2 R2
2nd square: U2 B2 U' F'
2x2x3 block: L' F'
More square: B' D' B
All but 3 corners: R2 F D F' R' * D'
Correction: R'

Insert at *: R F' R' B R F R' B'

I stopped at 30 min.

2nd scramble: F2 U' B2 D' R2 U' F2 D F2 U2 R2 F' U2 L' U R' B U L F2 U
2nd solution (1-hour): U L D' U L U L2 F' D F' D' F L2 U' L' F2 U F' U2 L F L2 F' L2 B' L D2 L B' (29 moves)

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(Inverse)
Pre-scramble: U' D L' U' (Firstly I used U2 D L' U' for EO, but modified)

2x2x2 block: B L' D2 L' B
2x2x3 block: L2 F L
F2L minus 1 slot: L F' L' U
All but 4 c/e pairs: U F U' F2
Cycle 4 c/e pairs: (L U L2 F' D) F (D' F L2 U' L')
Correction: U' D L' U'

3rd scramble: L2 D2 F2 D' L2 R2 D2 B2 R2 D' B2 L' B2 U2 F U L2 F' D B' D
3rd solution (1-hour): B' D B' L' D2 B' L U L U' L U2 B' R B2 R' B U2 L' U' B2 L2 B L2 U B' U' L (28 moves)

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10 min backup solution.

NISS solve.

(Normal)
2x2x2 block: B' D B' L' D2
2x2x3 block: B' L U L U2

(Inverse)
Pre-scramble: U2 L' U' L' B D2 L B D' B

Orient edges: L' U B U'
All but 4 c/e pairs: L2 B' L2 B2
Cycle 4 c/e pairs: (U L U2 B' R) B2 (R' B U2 L' U')
Correction: U2 L' U' L' B D2 L B D' B

I couldn't find any better solution in the remaing 50 min.

One of other starts was:

(Inverse)

Orient edges: U' F2 R'
2x2x2 block: D' F R2 B
2x2x3 block: D2 L2 B' D' B'