How many presses/reps do I need to do to say I can bench nth amount of weight?

I weigh 240lbs and my height is 5'6.75" (pretty much 5'7).

I did 3 presses of 195lbs. That includes the bar (45lbs), 2 of 45lb plates, 2 of 25lb plates, and 2 of 5lb plates combined. Of course, this occurred after I was benching lower amount of weight and worked my way up today.

Thoughts?

How many presses/reps do I need to do to say I can bench nth amount of weight?
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