It would make more sense for God to adjust the timepiece. Like turning a clock backwards. (Yes I realize it wasn't quite that simple, but for God no problem. Right?)
2Ki 20:9 And Isaiah said, This sign shalt thou have of the LORD, that the LORD will do the thing that he hath spoken: shall the shadow go forward ten degrees, or go back ten degrees?
2Ki 20:10 And Hezekiah answered, It is a light thing for the shadow to go down ten degrees: nay, but let the shadow return backward ten degrees.
2Ki 20:11 And Isaiah the prophet cried unto the LORD: and he brought the shadow ten degrees backward, by which it had gone down in the dial of Ahaz
Isaiah talks of the shadow moving, not actually the sun. Definitely much less stress on the planet.
It is interesting though that in Isaiah 38:9-22 which is supposedly a writing of Hezekiah, Hezekiah doesn't mention the miraculous sign. He mentions that his health was restored, but failed to mention such an unusual sign.
A gentle answer turns away wrath, But a harsh word stirs up anger.