The Ethereum Mainnet blockchain can be a busy place. StrongBlock has no control over the volume of transactions.
If you use “low” or lower gas than suggested by your wallet (for example: Metamask) then it could take several hours for the transaction to complete.
Ethereum Mainnet can be sped up by increasing the gas you use on the transaction.
Example: StrongBlock ALWAYS uses fast gas when we post a Ethereum Mainnet transaction.