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why the hashrateWindow is 30m and hashrateLargeWindow is 3h

Two transaction how to achieve ref-block by rpc

why the hsahrateWindow is 30m? and the hashrateLargeWindow is 3H?

I have successfully signed by ledger Nano S Plus and the transaction hash has been returned after broadcasting。But the transaction is not found on the blockchain by Txn hash 。...