Kabbalah zu Bamidbar 12:13

To pray quickly (is like the prayer of Moshe), "Heal her now, K-l, I pray You" (Bemidbar 12:13), (he addressed) the point of Yud. (Where) one should pray at length, as in 'to fall down' : "And I fell down (Heb. va'etnapal) before Hashem, as at the first..." (Devarim 9:18) (this is the letter Peh) "forty days and forty nights" (40 plus 40 equals 80, the letter Peh). Everything (is in the two) Mem's. (The) Yud as a point in the middle, which forms the word Mayim (Eng. 'water'). From the aspect of Chesed, one should pray at length.