How much often do you go to the gym?

What is your reason (goal) for going to the gym? What do you do when you're there?

If the goal is weight loss, doing exercise (at the gym or elsewhere) lets you eat a little more while losing weight at any given rate. Losing weight is all about calorie balance.

If the goal is fitness, your specific fitness goals matter: Do you want to be stronger, more heart healthy, good at some particular sport/activity, have better stamina/endurance, look more muscular or "toned", be stronger, or . . . ?

That matters.

No matter what, sensible people increase their exercise frequency/duration/intensity gradually, keeping just a manageable challenge in the picture. Going from zero gym days to 7 gym days a week is a recipe for overdoing, burnout, maybe injury.

If you're strength training at the gym, you generally don't want to be doing the same exercises every day, or even different exercises for the same muscle groups every day. As a generality, you want a recovery day in between strength workouts for the same muscle group.

In total, another thing that matters is good life balance: Having enough time and energy for your family, job, social life, home chores, non-exercise hobbies, and anything else important to you. That's very individual. For some people 3 gym days a week could allow that, for some 7, for some zero.

For general health, most mainstream health authorities suggest you should do a minimum of 150 minutes a week of moderate cardiovascular (CV) exercise, or 75 minutes of more intense CV exercise, or some equivalent combination of those; and that it ideally is spread over 5 days in the week. They also recommend at least 2 days a week of strength-challenging exercise. They usually say that if you're starting out pretty out of shape, that's something to work up to gradually; and that as you get fitter, more is fine if you have time/energy/enthusiasm for it. They don't care whether you do those things in a gym, at a park, in your living room . . . .

Me, I normally do around 2-4 times that recommended amount of cardiovascular exercise, but somewhat short-change the strength recommendation, though I do some. (That's not sensible of me, but I'm not going to lie about it.) These days, and for the last couple of years or so, literally zero of any of that has been in the gym. It's outdoors (rowing boats, riding my bike) or at home (rowing machine, stationary bike, weights, exercise bands, etc.). I've done a bit more since retiring - because it makes me happy and improves my life. But I did about the same amount of exercise when I was class 1 obese, during weight loss, and after weight loss. What changed was my eating. The objective measures I have say I'm fitter than average for my demographic, despite zero gym.

There isn't a strict answer for you. It matters what your goals are. If you aren't sure, that "mainstream health authorities" recommendation is reasonable to work toward. Don't let friends or relatives guilt you into doing something that isn't right for you.

Best wishes!