how long do ya'll go for when doing cardio on off-days? off-days meaning no weights. was thinking of heading to the gym during my normal gym hours (~5pm) and doing an hour of cardio at low intensity to aid fat loss but hopefully not burn muscle in the process. already performing 20 mins low intensity directly after workout, just looking to step it up a notch. any opinions on if this is a bad idea or not?
note: on off-days, i cut carbs to ~130 with a carb cutoff at 2pm, and replace carbs with flax oil on the remaining meals. on-days are ~300 with a cutoff at 6-7pm.