I am new at creating formula in Excel. I am trying to create a specific
timesheet. The employee can work a maximum of 70 hours in 7 days. I have
created this formula, which works for the pass 6 days but when I use it for 7
days, I have too many argument. I also have to create a formula for 13 days
and 14 days (maximum of 120 hours).

Works for pass 6 days:
=IF(D25=0,"0",SUM(IF(D20=0,(D21:D25),IF(D21=0,(D22 :D25),IF(D22=0,(D23:D25),IF(D23=0,(D24:D25),IF(D24 =0,D25,IF(D20:D250,(D20:D25),""))))))))

Too many argument (7 days):
=IF(D26=0,"0",SUM(IF(D20=0,(D21:D26),IF(D21=0,(D22 :D26),IF(D22=0,(D23:F26),IF(D23=0,(D24:D26),IF(D24 =0,(D25:D26),IF(D25=0,D26,IF(D20:D260,(D20:D26)," ")))))))))