That's easily done in a few rolls on autobet actually, so definitely very realistic. But let's have a look at 3 btc, on my style of playing I would need to have 1% of that as bankroll, which is 0.03 btc -- easily done to be honest. But instead of gambling 0.03 at max chance x100 I would probably do 1% of bankroll at x100 = 10000 times rolls. I wouldn't make it OR lose everything at 1% edge so I would probably try to gain 10% bankroll with martingale before doing 1000 times. Still definitely repeatable. I couldn't because of my speed here but someone with a direct line could!