I am just wondering, if I invest in a bankroll, how long does it usually take to recover 2% dilution fee? I invested yesterday and I am deeply in red.
You can derive/guess from historical stats:
https://dicesites.com/bustabit although it'll massively be affected by variance (i.e. it's not unusual for someone to win or lose 100+ BTC).
But realistically if your time frame isn't measured in months or years, it's a pretty bad investment.
Looking at the stats, I guess you could say that bustabit turns over around 6k BTC per week on average. EV of that is 60 BTC, which becomes an EV of 30 BTC for investors. With a 7.4k BTC bankroll, investors are expected to then profit 0.4% weekly, so it's expected that it'll take 5 weeks to recover the 2% dilution fee. However, like RHavar said, there is a ton of variance so you could recover all of the fee tomorrow or in 20+ weeks.