The APR of Liquidity Mining Pools shown on the website is an estimate and average calculated by using the current staking amount and bridging volume from the last 7 days (except for the initial days after a new token listing when no 7-day history is available. In this case, the longest available period between 24 hours and 7 days is taken). The actual Rewards depend on the amount staked as well as the size & amount of bridgings that occur in the future. The more of each, the higher the collected protocol incentive or bridging fees, and the higher the rewards.
The fees dedicated to Liquidity Mining Pools will be randomly sent roughly every second day (if a transaction occurs).