Will I gain weight if I completely stop going to gym?

Would you have been able to do a walk in the morning or evening of like 20 - 30 min during that time??

Nope. I get home around 2am, crash for 6 hrs, get up, eat breakfast, pack 2 meals (lunch & dinner) and head back to work. That said, I get up from the desk and try to get in a 10 -15 minute walk a couple of times a day.

During the off season (now) I get up at 5:30am and bang out an hour of exercise 6 days a week. I love it. I have good energy levels and the exercise helps reduce the stress. I'm also getting more sleep 7 - 8 hrs. During the busy season losing an hour of sleep would be a detriment to recovery. I'm not going to function well on 5 hours sleep for weeks on end.

I may try to experiment next year. Modify my strength routine to 20 minutes a session for 2 days a week. Not much work, but better than stopping altogether and starting over again. Something to think about.