i have tested this... my "can't miss" trap ring broke (the cable inside it rusted) and i fell off in about 15..

if i hadn't held the main... the boat would have left me.. i held tight, it sheeted as it took off and capsized...

i think it may make sense to carry flares and a vhf ON YOUR PERSON (along with a knife) if you plan to solo more than eyeshot off shore