Why would you keep huge amounts of tokens in an exchange?
As a novice, after reading your post, I'm presuming you mean centralized exchanges.
I've read before that once the trade is made, they should be placed in a wallet where the user has access to the personal keys.
The only exchange I'm currently using, due to missing the entrance to Bittrex, is Open Ledger...decentralized.
I'm not clear how your question relates to coins remaining on this platform. All of my current trades remain in my OL account.
As always, I enjoy your posts. Thanks for the knowledge.
I know you're busy working on other posts; thus, I welcome responses from all.
Peace.