How Much "Stolen" CPU Time Is Too Much?

I don’t actually have any issues with Virmach. Been using them for a few years. I’m running a Jenkins build server, Prometheus, Grafana and a few other tools on a Windows VPS with them and I haven’t faced any issues with CPU usage. It’s not my ‘main’ VPS - some downtime is fine and I take nightly backups of it just in case.