on a transfer "into" your trading acct? as in "from" your bank??
if this is the case, then it's a clearing/settlement issue if you're doing it via ACH or electronic transfer.
The only way to avoid this is by "wire transfer" as it's more or less instant. I'd rather pay my banks $12 wire fee to have it there in 30 minutes than to have it tied up for 3 days.
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