As someone who has done one meal/window a day for a decade, I assure you it's a self-correcting problem.
You wont ever starve if your meal is 700kcal one day. You will want to eat more the next day, your head will tell you. Or maybe you want some ice cream after in the same window?
On the other point, very few people who sit around all day need 2000kcal, unless they're relatively huge in any dimension. Either way you will find out if you count for a couple of weeks and if your weight is constant your average intake is your TDEE. If you're sedentary my bet is it's less than 2k.
I kept telling people this while powerlifting. I had several years worth of detailed records of what I ate, down to every sugar free chewing gum I chewed, and while going to the gym 5 times a week combined with a sedentary job, I burned at most around 2000kcal. My bulking diet was at 2400kcal. I was at near competitive level weights at that point.
I feel so much obesity is down to people thinking 2k or even 2500kcal is right for them despite an activity level that means they might be closer to 1500kcal-1800kcal.
Absolutely concur with your advice to count for a couple of weeks, and I'd back that bet...
6'1, about 200lbs when at my leanest (15% or so body fat). 3100 sounds very high to me for your weight unless you're all muscle and very active, but very much in line with the kind of recommendations I'm used to seeing.
But your experience will vary massively depending on how active you are, including how hard you hit the gym.
It's not impossible it's right, but really just count for a few weeks and keep track of your weight, and then adjust up/down up to a few hundred kcal until your weight is changing the way you want it tp.
Unless you're super-lean there's very little reason to add more than 300-400 kcal above maintenance at most (I do less these days) - big bulking cycles take a lot of discipline to break out of. I generally favour slow but steady these days as I'm back into lifting.
Age also factors in - you can expect slower progress the older you get and accordingly you'll need fewer extra calories if you want to avoid adding fat. Conversely, if your testosterone levels and metabolism are at their peak, you might well burn more.
Counting and tracking is really the only thing that will tell you the right numbers for you.
You wont ever starve if your meal is 700kcal one day. You will want to eat more the next day, your head will tell you. Or maybe you want some ice cream after in the same window?
On the other point, very few people who sit around all day need 2000kcal, unless they're relatively huge in any dimension. Either way you will find out if you count for a couple of weeks and if your weight is constant your average intake is your TDEE. If you're sedentary my bet is it's less than 2k.