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The algorithm is programmed to analyze the supply rate functions across integrated protocols and total funds in the pool, and it's able to constantly rebalance capital across any number of protocols to earn the highest interest rate possible with very high precision.
Several factors can trigger a rebalance. Factors related to network conditions/congestion, and if a new allocation exceeds the previous one by a significant percentage. Hence, the timing is variable.
In general, a rebalance happens every 3 hours on Ethereum and hourly on Polygon.
Yes, any user who has already deposited funds within one or more pools can add additional funds to the current deposited assets.
Each addition of new funds always requires a confirmation and signature via smart contract, and therefore require to pay the related network fees (not controlled or received by Idle in any case).