I have the following formula in excel
=CONCATENATE(\"insert into #UpdateData (mondayopenhour, mondayopenmin,mondayclosehour, mondayclosemin,tuesdayopenhour,
Now this is one messy function. You have to seperate your input to CONCATENATE.
Right now you have there only one very big string starting on "insert ..." ending on "....MID(O2,3,2),")" - or at least, that is where I think this ends, because of all the "," it's really tough to step through this.
Here is how you should use CONCATENATE:
=CONCATENATE("insert into #UpdateData (mondayopenhour,","mondayopenmin,")
You can extend this, so you won't have a single string which is longer than 255 characters.
edit: by the way - your current string has about 972 characters.
you can ease the seperation by using this formula:
=MID("insert into #UpdateData (mondayopenhour, mondayopenmin,mondayclosehour, mondayclosemin,tuesdayopenhour, tuesdayopenmin,tuesdayclosehour, tuesdayclosemin,wednesdayopenhour, wednesdayopenmin, wednesdayclosehour, wednesdayclosemin,thursdayopenhour, thursdayopenmin,thursdayclosehour, thursdayclosemin, fridayopenhour, fridayopenmin, fridayclosehour, fridayclosemin, saturdayopenhour, saturdayopenmin, saturdayclosehour, saturdayclosemin, sundayopenhour, sundayopenmin, sundayclosehour, sundayclosemin values ('",TRIM(A2),"',",MID(B2,1,2),",",MID(B2,3,2),",",MID(C2,1,2),",",MID(C2,3,2),",",MID(D2,1,2),",",MID(D2,3,2),",",(MID(E2,1,2),",",MID(E2,3,2),",",MID(F2,1,2),",",MID(F2,3,2),",",MID(G2,1,2),",",MID(G2,3,2),",",MID(H2,1,2),",",MID(H2,3,2),",",MID(I2,1,2),",",MID(I2,3,2),",",MID(J2,1,2),",",MID(J2,3,2),",",MID(K2,1,2),",",MID(K2,3,2),",",MID(L2,1,2),",",MID(L2,3,2),",",MID(M2,1,2),",",MID(M2,3,2),",",MID(N2,1,2),",",MID(N2,3,2),",",MID(O2,1,2),",",MID(O2,3,2),")",2,255)