Dave wishes that Excel would offer a REPTARRAY function, just like REPT but for arrays. This video shows four different ways to repeat an array N times.
Vote for Microsoft to add REPTARRAY:
https://feedbackportal.microsoft.com/feedback/idea/0f6d6e22-7cb3-ed11-a81b-002248519701
Details about FastExcel: FastExcel V4 SpeedTools
Here are the formulas used in the video:
=TEXTSPLIT(REPT(TEXTJOIN(",",TRUE,A)&",",$E$1),,",",TRUE)
=DROP(REDUCE("",SEQUENCE($E$1),LAMBDA(a,b,VSTACK(a,D))),1)
=LET(a,E,rw,COUNTA(a),MAKEARRAY(rw*$E$1,1,LAMBDA(r,c,CHOOSEROWS(a,MOD(r-1,rw)+1))))
If you have FastExcel V4 from Charles Williams:
=REPEAT(A2#,E1)
If you have a better way, please post below in the YouTube comments.
Excel Most Efficient Way to...