Excel Protected Workbook Known PW Length

[Snoopy]

windows taskmanger doesnt show the real work on your GPU, stick to the utilisation % hashcat tells you

second
spreadsheet or worksheet? there are some real easy ways to "delete" the password if it is this new style XLSX, just involving 7zip and editor

third
if you are able to open the excel worksheet you can also use a makro to "crack" your PW

Code:

Sub BlattschutzEntfernen()
On Error Resume Next
For i = 65 To 66: For j = 65 To 66
For k = 65 To 66: For l = 65 To 66
For m = 65 To 66: For n = 65 To 66
For o = 65 To 66: For p = 65 To 66
For q = 65 To 66: For r = 65 To 66
For s = 65 To 66: For t = 32 To 126
ActiveSheet.Unprotect Chr(i) & _
Chr(j) & Chr(k) & Chr(l) & _
Chr(m) & Chr(n) & Chr(o) & _
Chr(p) & Chr(q) & Chr(r) & _
Chr(s) & Chr(t)
Next t: Next s: Next r: Next q
Next p: Next o: Next n: Next m
Next l: Next k: Next j: Next i
MsgBox "Blattschutz aufgehoben"
End Sub