Hi everyone 👋 Can someone point me to some docs about IPNS. I can't seem to understand a few things about it. 
1. When I publish a name via my node, does it have to stay online, for other to be able to resolve the name?
2. How long will the name be resolvable? I know there is a TTL flag, but what exactly can I enter there?
3. Will ipns via pubsub be faster than the usual method?
Thanks in advance!