Can't be sure about the lower leaves problem, they do start to die in flowering but seems a little early. I'd try flushing it out, you may have a nute lock out and it won't do it any harm even if it dosn't.
I'd guess about 6 weeks till it's done, if your desperate to see what it smokes like you can probably get something decent in about 4 weeks, just choose carefully, don't be gready!
Oh and good luck!
hudson88 Reviewed by hudson88 on . first grow questions w/pics My plants have brown dead patches on some of the lower leaves, any ideas what that may be from? Also are those buds I see? Could I experiment, smoke and dry one? If they aren't buds how long do you think until they are? Rating: 5