It all depends on how long someone's arms and legs are.
How far did the umayyads extend their empire
3 inches
Greenhouse gases extend very high. They extend in the troposphere.
Mexico
As far as it is now.
Mexico
The cord for the electric stove can extend out for a couple of feet.
100m
20 to 40 degrees
From today's Portugal to Iraq.
Tree roots typically extend as far as the tree's canopy, which can be two to three times the diameter of the tree's crown.
Past Earth's orbit