The shortest possible time (down to the wire) if everything goes as planned is 3 days and if you need to sell shares for cash to exercise those warrants you can add the settlement date to that time line. Going down to the wire is risky since any hiccup can result in  missing the timelines and the Warrant Agent is very strict about this. 

In my opinion anyone selling shares to generate cash to exercise these warrants should have already done so by now (but no later than Mar 1). 

OFC begins  the second week of March and companies like to issue news during the event for the added exposure  they receive.