Just noting that if you change both of the A2 references in the formula you marked as the answer to A2:A11, it will generate the entire output from that one single formula (no copying down will be necessary)...
=TEXTBEFORE(A2:A11,"m")/(60*24)+IFERROR(TEXTAFTER(TEXTBEFORE(A2:A11,"s"),"m ")/(24*60*60),0)
Also, here is a shorter alternative solution that will also generate the entire output from a single formula (again, no copying down needed)...
=0+SUBSTITUTE(SUBSTITUTE("00:"&A2:A11&" "," m ",":")," s","")