Well, it takes 30m the first time, when learning from scratch. When learning the arcane cron entry system, I'd guess it takes even longer than 30m, unless you have a simple time in mind (like "every minute" or something similar - "every second Monday" is definitely more complex to reason about in cron). Again, comparing not knowing systemd timer vs not knowing cron.
Sure, not saying you can just sit down and do it straight away. But the additional complexity of systemd, I think, makes it even more daunting. It’s much like how modern frontend has a million components. I understand there are or were reasons for all of it, but not everyone needs it, and it’s intimidating to a newcomer.
In comparison, cron (and *nix tooling in general) asks you to learn a small bit of that tool’s syntax, and that’s it. You can add complexity if you’d like – read the man pages – but for the most part, you can be productive very quickly.
