Barring the implied criticism, yes. But here's the complete story:
I'm 36 and been a couch potato my entire life - despite what might be not too bad genetics: my mother and father were first-league athletes some decades ago, and in high-school I wasn't too far behind the regional champion fast runner (who was my buddy in high-school).
But due to below-average exercise and way below average calorie intake, I've been pencil-thin my entire life.
Tired of being a geek I started to change that a couple years ago and, now I realize, I went through all typical newbie mistakes (this website was invaluable to uncover them and teach me good lessons, thank you!): did same exercises over and over again, didn't eat enough, etc.
Despite that, I made excellent progress as far as strength is concerned. The absolute numbers will make you guys laugh, but I'm pleased with the relative numbers: as little as 2x improvement for some muscles and as much as 5x for others.
Muscular volume growth, though, is a different story. After a lifetime of sleep, my body is reluctant to wake up.
I've a very busy job at a high-tech company, I'm a father of two (I have to finish up this message quickly because they're making a ruckus), the young one not even a year old, and additionally I'm going through some very tough challenges in my life currently. That will end at some point, no doubt, but the stress it's taking its toll.
I tried to work out 6 days a week, per some book by Arnold that I read a while ago - and burned out.
Tried 5 days and burned out again.
4 days was much better and it seemed like I could do this under normal circumstances, but that's not the current situation.
So I dropped down to 3 days a week (Mon, Wed and Fri), taking care to hit every muscle at least 2 times a week. But I wonder if working out each muscle twice a week is enough.
So that's why I asked.
Hopefully, when everything in my life gets back to normal, I'll go to the gym more often. Until then, I'd use the gym to give me strength for my other endeavors and duties, rather than the other way round. Trice a week seems like the magic bullet in that regard. But I wonder if it's enough to produce sustained muscular growth and increase of strenght.
Thanks everyone for the good advice you gave on this website!