If an org table cell contains the HMS 1@ 11' 37"

is there an easy way to get the total (time)seconds?

(1*3600 + 11*60 + 37 = 4297)


if $4 =  1@ 11' 37"

how do I get $8 = 4297?

thanks

ryan

--
He felt that his whole life was some kind of dream and he sometimes
wondered whose it was and whether they were enjoying it. - Douglas
Adams