Essentially I would personally trust liquid with at least a few million sats. I don't think it's something I would personally keep more than a quarter of a Bitcoin on it though. That may change of course and that level is different for everyone. But it's a great tool to have a few million sats on if and when high on chain fees happen and you need to do anything with lightning. You scan swap liquid to ln, so it's really cheap to manage liquidy on a lightning node with liquid even in high fee environments.