Sorry to tell you that the lucky draw has the duration time as the same as the ranking events in Events, also you can see the event time in the lucky draw page, so please use up the chances before it ends each week. Hope it helps. Thank you.
With the last 2 Updates the Improvement changed that you Need to be a member 2 lvl Minimum. It should been given the Option to improve the troops with Silver again. The development seems to go to a 100% Pay to Play game :-( It was nice but if it don´t Change I and I think most Players will stop playing.
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Sorry to tell you that the lucky draw has the duration time as the same as the ranking events in Events, also you can see the event time in the lucky draw page, so please use up the chances before it ends each week. Hope it helps. Thank you.