When I have someone talking more than 6 minutes, my calculation stops
working. (see NUM reference below)

=TIME(0,0,G1*60)
SEC's TIME
G H
477.59 7:57:35
351.43 5:51:25
306.26 5:06:15
367.17 6:07:10
538.60 8:58:35
357.57 5:57:34
515.69 8:35:41
356.45 5:56:27
338.65 5:38:38
559.13 #NUM!
659.52 #NUM!
379.83 6:19:49
274.99 4:34:59
312.54 5:12:32
294.35 4:54:21