I have been entertaining those thoughts.  Dont 
Latch and 
Scratch discuss that 
Durai has plans for those tankers while he is spying on them?  That is only 7 to 10 days into the outbreak.  I know there is a prejudice to put that event closer to the party, but those things are designed for a week, not months.  Since they pick up 
Lady, it is still close to the initial outbreak.  Later, 
Lizzy even remarks that the sweat jars were three weeks worth of work when 
Kelly is looking for stolen items in Lizzy's room.  So, it seems like a week into the outbreak Durai is looking to fire bomb someone...