Firtst of all Sustanon is not primarily used for fat loss as it is a blend of four testosterones. This will create some bloating as the interstitial fluid will increaase to help your muscles leverage scheme. But like most testosterone the presence will help burn fat and increase muscle mass. The time is almost the same for the catabolic pathway, the recovery time though is a lot faster. So you can be in a catabolic state for the last 20-30 minutes but with sust the anabolic properties will far outweigh that side. Your best bet is to hit the gym 2x each for less than an hour. And the fat burning properties of gear is the ability to maintain or increase muscle mass will on a calorically deficient diet...