If one concluded a blessing with the wrong words, then if the amount of time it takes to say Shalom to his Rebbe has yet to pass [which is the amount of time it takes to say the three words of “Shalom Alecha Rebbe”[2], which is 2-3 seconds[3]], then he is still able to correct himself with the correct wording.

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[1] See Admur 582:2 [regarding Hamelech Hakadosh]; Michaber 209:1-2 regarding fixing a blessing; M”A 209:4-5; P”M 209 A”A 5; M”B 46:20; Kaf Hachaim 46:46; Piskeiy Teshuvos 206:9; Encyclopedia Talmudit Erech Brachos Vol. 4 pp. 306-309 footnotes 199, 203-204

[2] Admur 206:3; Kneses Hagedola 206; Olas Tamid 206:3; M”A 206:4; Elya Raba 206:5; Chesed Lealafim 206:3; Ben Ish Chaiy Balak 3; Kaf Hachaim 206:15; 582:9

Other Opinions: Some Poskim rule that it contains four words “Shalom Aleichem Rebbe Mori.” [Beis Yosef in name of Shivlei Haleket; Levush; Taz 206:3; P”M 487]

[3] See Sdei Chemed Kelalim Taf Peas Hasadeh Mareches Hei; Piskeiy Teshuvos 206:9