Best proportion for BTC_TRADING_LIMIT

[BeagleMan]

I'm wondering if there is any consensus on what the ideal proportion of total bankroll to BTC_TRADING_LIMIT should be. If set too low, any returns will be minuscule, but set too high, and you greatly increase the risk of ruin. From the posts I've read here, it seems there are people trading with a wide range of bankroll sizes. Does anyone have any rules of thumb on how to choose that parameter optimally?

[paramecie]

I'd do:
Set it first with no override.
Let it run for hours, a day, see the pairs that are better working, increase the trading limit with a specific override for each pair, depending your confidence.
At the contrary, if some pair is sinking, override with buy_enabled = false.

[GuyTheGuy]

I always hear 10-30%, i personally use 20%