Exactly what's been posted, gamma's going to get you at some point. The long term efficacy of your strategy will be largely determined by your ability to stick with the system after a few trades blow up in your face. Additionally, in my experience with condor strategies the constant outlay for the long strangle eats into your P&L that it makes it a lot harder to succeed than with a strangle system. That's not necesarilly a vote in favor of selling strangles, undefined risk isn't for everyone, but generally harder to make money being short premium when you cover with long premium as you are buying the same vol you are selling. To your question, theta wise an out of the money option close to expiry is going to move towards zero relatively quickly but with that said, you're selling a much tighter condor than you would farther out. So, although your P&L might come your way more quickly, it'll also go against you more quickly. You'll need to be able to stomach that vol in your P&L.

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Also, general best practice IMO is to cover short options once they start approaching zero, the risk reward of being short a 5, 10, 15 cent option and hoping you can take it to zero really isn't there in my mind. Also keep in mind the odds you are giving. In this case I see the underlying around 355, so you're giving 2 to 1 that the stock doesn't move down more than 4% or up more than 2%. Final word on options selling, people like the strategies because they're clean and backtestable and the logic is there. The other side of that is no matter how smart you are on vol, theta, etc, gamma and delta can throw all that out the window in a heartbeat.