https://ethstats.net/It looks like roughly 16MM gas worth of transactions has been getting through on the ethereum network per 10 minutes, because many 0 transaction blocks are getting mined
less than 3000 transactions to distribute all the ICN (assuming 500+ investors didn't provide a ETH withdrawal address)
Token-sending transactions use about ~3.5x the gas of a normal ETH sending transaction, so around ~75000 gas per transaction.
(75000 gas per transaction)×(3000 transactions) = 225MM gas
(225MM gas) ÷ (96MM gas per hour) = 2h 20m
It would take iconomi a minimum of 2h 20m to send out all the ICN withdrawals.
If they increase the gas price of their transactions to 20x the normal rate of 0.00000002 ETH per gas:
(225MM gas)×(0.00000040 ETH per gas) = 90 ETH
If they wanted to distribute all the ICN with the network in its' current state, I estimate they could do it in less than 4 hours for less than 90 ETH