I work at a place now that ditched the time estimates and the sprint planning meetings and standups that go along with that and it's so much better.

Time estimates are always wrong, it always slips to the right. This is always used against you. You suffer because of it. Your work suffers because of this.

I get a couple extra hours a week by not doing daily standups, retrospectives, sprint planning, etc etc. This allows tasks to be shipped faster.

If there's a problem I communicate it up and stakeholders understand.

Want to know how long it might take? Look at some historical tasks in Jira and compare timestamps.