Hi Raphael,
You can use 'pm2' (https://www.npmjs.com/package/pm2) to manage your node
processes.
1. Start the node applications from pm2 instead of vanilla node
pm2 start server.js --name=someName
2. Use the startup command (http://pm2.keymetrics.io/docs/usage/startup/) to
create a startup
Adding to Zlatko anwser,
You definitely need a queuing system (or probably is using it already).
That is because it's a long running job from what I understand (as you
mentioned magnitude of hours). The queuing system can be a simple custom
solution based on a database or even plain filesystem
