Ensure duration can be safely converted to a uint64_t.  Fix for BMO #1269779.
Ensure duration can be safely converted to a uint64_t.  Fix for BMO #1269779.

SingingTree/nestegg,kinetiknz/nestegg,kinetiknz/nestegg,fallaciousreasoning/nestegg,SingingTree/nestegg,SingingTree/nestegg,fallaciousreasoning/nestegg,kinetiknz/nestegg