It depends really. If you're a 70kg like I am (ecto, long arms) then I doubt I'll ever in my life bench 100 x 10. But if you're a stocky 70kg @ 5'6 or something, with shorter arms, you're probably capable of alot more. Either way BW is a good lift, but a 30kg jump on the bench is gonna take a long time, unless of course you're a noob at lifting and 70 x 10 is your first ever attempt at the bench, then you could easily put 30kg on it in short time with noob gains.