Blockchain Confirmations and Instant Swaps: Why Your Swap Waits, and How Long Each Chain Takes

You start an instant swap, send your coins, and then… nothing happens for a while. That pause is almost always blockchain confirmations — and it's not the swap being slow, it's the network making sure your deposit is final before anything can move. Understanding confirmations explains why your swap "hasn't started yet," how long each chain typically takes, and what you can do to speed it up. This guide breaks it down.

This is general educational content, not financial advice. Confirmation requirements vary by exchange and coin; treat the numbers below as typical, not guarantees.

What a confirmation is

When you send a transaction, it's first broadcast and sits unconfirmed in the network's queue. A confirmation happens when a block including your transaction is mined or validated. Each additional block stacked on top is one more confirmation — and the more there are, the more permanent and irreversible your transaction becomes. One confirmation means "it's in a block"; several mean "it's extremely unlikely to ever be undone." New to the basics? See What is an Instant Swap Exchange?

Why a swap can't start until your deposit confirms

An instant swap converts coins it has actually received. If it credited your deposit the instant it saw it — before confirmations — it would be exposed to double-spends and reversals, where a transaction appears and then gets replaced or dropped. To protect itself (and you), the exchange waits for a required number of confirmations before it treats your deposit as final and begins the conversion. So the real sequence is:

1. You send your deposit; it waits for the required confirmations on its chain.
2. Once confirmed, the swap converts at the quoted rate.
3. The swap sends your payout — which then needs its own confirmations on the destination chain before it shows as final in your wallet.

That's two separate networks and two separate waits. The swap genuinely cannot begin until step 1 clears — it's not stuck, it's confirming.

How long each chain takes, on average

Block times and the typical confirmations exchanges ask for vary a lot by network. Common ballparks:

• Bitcoin (BTC) — ~10-minute blocks; often 1–3 confirmations required, so roughly 10–30 minutes.
• Litecoin (LTC) — ~2.5-minute blocks; often 3–6 confirmations, so roughly 8–15 minutes.
• Ethereum (ETH) — ~12-second blocks; commonly a few dozen confirmations for finality, so roughly 3–7 minutes (gas spikes can delay the send itself).
• Monero (XMR) — ~2-minute blocks, and the protocol locks outputs for 10 confirmations, so about 20 minutes.
• Solana (SOL) — sub-second slots with fast finality, usually under a minute.

These are typical; each exchange sets its own thresholds, and may require more for larger amounts. You can see real examples of the two-chain wait in Litecoin to Bitcoin, Ethereum to Bitcoin, and Solana to Bitcoin.

How to make sure your swap processes quickly

You can't change a chain's block time, but you control how fast your deposit gets into a block:

• Pay an adequate network fee. This is the single biggest lever. Underpaying leaves your transaction sitting unconfirmed, which delays everything downstream. Check current conditions on mempool.space and pick a fee that targets the next few blocks — see Network Fees Explained.
• Send when the network isn't congested where you can; fees and waits both drop off-peak.
• Use RBF or CPFP on Bitcoin. If a BTC deposit is stuck on too low a fee, Replace-By-Fee (or Child-Pays-For-Parent) can bump it so it confirms instead of languishing.
• Pick a fast chain for the deposit leg if you have a choice — sending from Litecoin or Solana clears far quicker than from Bitcoin.
• Send promptly within the quote window. Locked quotes expire; a slow-confirming deposit can blow the window, and on a floating rate the amount is set when the deposit finally confirms.

What to expect overall

Add it up: your deposit's confirmations + the conversion + the payout's confirmations. A BTC-involved swap can be 20–40 minutes end to end; an all-fast-chain swap can be a couple of minutes. None of it is the exchange dragging its feet — it's the networks doing their job. If you want to skip Bitcoin's wait entirely for the BTC side, Lightning swaps settle in seconds.

Confirm with confidence on SwapRaven

Knowing the confirmation step means you'll never mistake a normal wait for a problem. Pay a sensible fee, send within the window, and let the networks finalize. When you're choosing where to swap, SwapRaven grades no-KYC instant swaps on trust, speed, fees, and supported coins — so you can pick one that processes promptly and delivers straight to a wallet you control.