While reading this post How does muscle build up when we exercise?. I read there that recovery time (rest before your next workout) is important to increase muscle. Now there are 2 questions I want to ask.
1) I go to gym daily 1 hour in morning, my trainer has set schedule for me like 1st day shoulder + bicep, 2nd day chest + triceps , 3rd day abs + back + wings etc(don't exact remember groups, but 2 muscles a day repeated 2 times a week); and repeat this for next three days, and Sunday rest. That is 3 days recovery to a muscle. But after completing his schedule, as I have free time, I take some rest(15 minutes) and do exercise of show off muscles like bicep, triceps and chest(depends on my mood), so my question is will this extra exercise support me to gain muscle or let down the process as I am not giving recovery time to that muscle.
2) Also at night(9-11 pm), I have dumbbells at home so I do exercise of above mentioned show off muscles(any muscle depending on my mood), so another question whether this late night exercise of random-ally any muscle will support or let down my ultimate goal of increasing muscle(muscle size). I am 28 years old weighting 69 kg.