The transfer itself should take place quickly (depending on the exchange itself). However there is currently a bug causing delays in the balance updating on the wallet. The dev team is aware of this and working on a fix. There is also a new update coming to the app soon that will make this process much quicker and more efficient, and make the app generally easier to use as well, so keep an eye out on our communities for when that is rolling out. It should be within the next month or two. In the meantime, and thanks to the magic of blockchain/open ledgers, you can always confirm your transactions by using a block explorer. Simply copy/paste your receive address into the interface. If you can see the tx confirmed in the explorer, it has already arrived at your address, the delay is just the balance updating in the app, which will be rectified soon. For eth based tokens use, for OMI/Go based tokens