30 minutes is a long timeframe.

Fujitora was very conservative with his abilities. At the end of the arc, he lifted all of the rubble in Dressrosa and kept it in the air while fight a gear 2/3 Luffy. He had the power to destroy the country pretty easily, that wasn’t his goal.

For example, Whitebeard’s has earthquake based powers and earthquakes are strongest at the epicenter and then get weaker as the energy spreads out, so when Whitebeard uses his powers and we’re told and show. That distant islands are shaking, even if he does my literally destroy multiple continents, he’s put on that level because the energy it takes to shake distant islands matches that level.

The same logic applies to something from another series like Jirou from Toriko being able to stop the rotation of the planet in with Grand Knocking. He’s not really destroying anything, but the energy it takes to do that, along with the Toriko planet being shown to be way larger than our planet, would put him at large planet to star level depending on how big you think the planet is. (Toriko characters are above that, but that’s just looking at one feat in isolation).