8:11, The key idea that I advocate for in troubleshooting model, since it can be really really hard to disambiguate what is the cause of this degradation and performance what is the casue of this error, the strategy that we’re going to take is we’re going to start with something that’s as simple as possible and then we’re gradually going to ramp up the complexity. … then we can isolate that small change that we made as the degradation and performance or the unusual performance. So we can start our debugging there.