Why does the estimated time on a swap quote show a window instead of one number

07 September 2026

The estimated time appears as a window because no one can predict exactly when a blockchain will confirm a transaction. The window accounts for natural variation in network conditions, mempool congestion, and the probabilistic nature of block production.

When you request a swap quote, the system must estimate how long the entire process will take. That process involves multiple steps: submitting a transaction to the source blockchain, waiting for confirmation, communicating with the destination chain, and then finalizing the output transaction. Each step has its own uncertainty.

Network congestion is unpredictable

Blockchains do not process transactions on a fixed schedule. Bitcoin targets a new block roughly every 10 minutes, but actual times vary. Ethereum blocks appear every 12-15 seconds in theory, but gas prices spike when many users compete for space. A swap that begins during a quiet period might confirm in minutes. The same swap during a popular NFT mint could wait for dozens of blocks.

The system sees current mempool conditions when it generates the quote. It knows the fee you have chosen. It cannot know whether five new high-fee transactions will arrive before yours is picked up. That uncertainty forces an estimate range.

Fee selection changes the timeline

You choose a fee tier when you initiate a swap. Higher fees generally lead to faster confirmation, but they do not guarantee a specific block. A low-fee transaction might sit in the mempool for hours if the network stays busy. The estimate window widens for lower fees because the possible wait time stretches further.

Cross-chain mechanics add another variable

Swaps between different blockchains involve relayers or bridge operators. These systems wait for a certain number of block confirmations before they consider the source transaction final. The number of confirmations varies by chain. Some chains treat one block as final. Others wait for 30 or more. The relayer itself must then submit a transaction on the destination chain, which faces the same mempool uncertainty.

The estimated window combines all these uncertainties into a single range. It is honest about what you can expect, rather than promising a precise minute that the system cannot deliver.

What to do while a swap runs

If your swap is still inside the quoted window, there is usually nothing to do but wait. The system is tracking it. If the window passes and the swap has not completed, you should check the status page. That is where you will find detailed guidance on why a swap sits pending and what to check. The hub page under that title explains how to verify your transaction on the source blockchain, what pending means for different chains, and when to contact support.

The time window exists because blockchains are not deterministic. Accepting that uncertainty is part of using them. A range is more useful than a false promise.

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