Quote:
Edit: Hmmm - is this 15 minute part valid? I am not so sure now...



Don't think so, thanks to the unequal burn time along the fuses.

For example, imagine that the second fuse takes burns very quickly for 99% of its length and very slowly for the last 1%, such that the last 1% takes 59 minutes.

If you light it at both ends and the middle, then one half will burn in 15 seconds and the other half will take 27 minutes 45 seconds to burn (roughly).
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Remind me to change my signature to something more interesting someday