Rnds in BLO: 7 - 11, 13, 15 - 17, 19

Colorchanges
Color 8: Rnds. 59, 60, 62 - 64
Color 10: Rnds. 65, 66, 68, 70, 72, 74
Color 5: Rnds. 67, 69, 71, 73, 75, 76
Color 9: Rnds. 79, 80, 83
Color 6: Rnd. 80
Color 3: Rnd. 81
Color 1: Rnd. 82

After Rnd. 83 is a good stopping point for a “small” (appr. 109 cm) Square! You will be fine with 1 Skein of each color
As final Rnd. I would recommend *(sc, ch2, sc) in corner sp, BPhdc til next corner sp* 4 times in Color 7