Can i count "hours" in a row with SUM, but show Names/Characters in the cell?

Question

I would like to let Google Sheets count "hours" in a row together, BUT we use "Characters" instead of Numbers when we update the Document.

Can we do a secondary Table and calculate everything together and then output the total number in the original table?

I've made a picture for a easier understanding:

Answer 1

try:

=ARRAYFORMULA(SUM(IFNA(HLOOKUP(A1:Q1; 
 {{"F" ; 8,5 }\ 
  {"U" ; 7,7 }\ 
  {"D" ; 2   }\ 
  {"N1"; 11,3}}; 2; 0))))

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for multiple rows use:

=ARRAYFORMULA(MMULT(IFNA(HLOOKUP(A1:Q3; 
 {{"F" ; 8,5 }\ 
  {"U" ; 7,7 }\ 
  {"D" ; 2   }\ 
  {"N1"; 11,3}}; 2; 0))*1; ROW(INDIRECT("A1:A"&COLUMNS(A1:Q)))^0))