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it depends on the coins volume, look at the market history and bids and you get an idea of what you can bet.
This particular coin has a good volume on bittrex so you can probably get away until 10 eth bets

Coin Marketplace

STEEM 0.06
TRX 0.32
JST 0.059
BTC 66535.04
ETH 2000.20
USDT 1.00
SBD 0.48