I applied for AP Travel Document on last week of August, it came fast within 3 weeks but it is valid until Dec 2015 only ( to travel and get back by dec 2015), I applied through the lawyer with just the regular documents needed for TPS and EAD. I am still waiting for TPS and EAD. When I asked the lawyer, she said, its in the hand of USCIS how much time they allow in Travel document, so I will suggest you to apply maybe a month before you are travelling to be on the safe side.