I have sent 0.5 BTC almost 2 hours ago but i can't see anything at 'my bitcoin investment history' ...
Is it normal that it has some delay to show on dashboard?
Another question, do they have a target of funds they want to gather? Or is it unlimited?
You probably put your transaction fee too low. Take your tx id and check it up on blockchain.info. If it remains unconfirmed for a long time then your transaction is being ignored by the miners. There are currently many transactions behind totalling several 1MB block sizes that are ignored due to low fees.
If you sent it from an exchange then there is nothing that you can do but wait. If you sent it from a private wallet, then you need to do a child-pays-for-the-parent transaction with the coins in the change address using a high fee which will cause both transactions to be prosessed. You shouldnt send BTC nowadays with a fee less than 40k sats, that is until BTC block tx capacity increases.
Electrum caters for CPFP and you need to get your private keys for both addresses imported.
If the tx is confirmed but still not on the dashboard, there is probably just a processing backlog on the ICO server backend.