I noted recently that if your IP is dynamic (ie: it changes every now and then), your inbound nodes may suddenly drop and it might take a bit of time for new ones to reconnect.
What is that "6 hours"? The minimum time I have to run continously the full node? Or the total in a day (like 3 hours + 3 hours)? And what if I run only 4 hours?
Thanks!
It can be the total time and you're free to run the node for any amount of time as long as it's enough for all new blocks to get validated while you're online.
As an example, if you turn off your computer when the block height is 600,000 and then turn it back on when the new height is 600,050
you will need to download and validate those new 50 transactions before you are running a fully synced node.
If eventually you cannot catch up then your node becomes less and less helpful for the network, but if you're running your node on your personal computer and it's powerful enough, syncing should be quite fast.
Another note is that if you are looking to connect to your wallet to your own node for privacy, you need to be fully synced.