So the danger of excess protein consumption is hyperammonemia if you can’t convert enough nitrogen into urea and excrete it. The general formula is (91.025mg Nitrogen * kg bodyweight * hours)^(3/4). This only counts excess nitrogen that isn’t being used though.
So for a 150lb person that works out to 42.92g of Nitrogen per day. Each gram of Nitrogen represents 6.25g of protein on average so that’s 268.25g protein over requirements. Maximum substrate utilization is roughly 1.8g/kg bodyweight so that would be 122.47g protein as the requirement level. So as long as you’re eating less than 390.72g of protein per day as a natural trainee then you’re perfectly safe. For comparison, that’s roughly 3.19lbs of sirloin steak.
Obviously if you’re using steroids then your substrate utilization will rise and that will increase your maximum protein tolerance.
In short, quit worrying about it. For a lifter of your size you should be eating at least 123g protein in order to get enough amino acids to build new muscle tissue, additionally if you’re eating four meals a day you can maximize muscle protein synthesis at 43g per meal which works out to 172g of protein per day.
I’m 150lb per the example. So around those 123g protein would be an ideal amount for general health, or is mainly for muscle building? I find I go above 123g easily, and I get a bit weird out when other people say they get 70g a day, which I sometimes gulp down in one go.
What if you eat 2 meals a day, what would be a reasonable amount to share the protein? I usually eat lighter during the day and a heavy meal at night, I feel better this way.
Did you read any of the responses to the OP? This was just answered multiple times and ways.