How do I know how much lookback I need?

the lookback will depend on the indicator you are using for example, if you are using an sma with a length of 20 candles, you will need 20 candles of warm up if you are using 30min candles that would be 10hrs so 1 day is plenty if you are using 12 hour candles you would need 10 days and so on here's 2 examples of a dma (35 candles) plot on 1h candles in the same period using 10 days lookback using 1 day lookback we try to auto update the lookback value based on the candle you selected, but users should always check to make sure it fits their strategies