Create a result you can trust
Keep one offline observation separate from active chopping. The goal is not to prove an exact game-wide rate; it is to know what happened to your own wood count during one clear window.
Record the wood shown now
Write the visible wood total and the time you leave.
Record the new total
Note when you return before changing equipment or selling.
Repeat one similar window
A second observation makes an unusual result easier to spot.
Do not merge offline and active numbers
If you chopped before leaving, record that as an active session first. If you sell after returning, record the sale separately. Combining them makes the offline result impossible to interpret.
Axes farm wood while you are away
That is the supported offline claim. The source does not state which axes have which rate, whether there is a cap, or how long any return takes to process.
When a result looks different
Check your before and after screenshots, the elapsed time, and whether you changed a visible plot or axe condition. Do not replace a surprising result with a community number that cannot be checked.
Compare axes carefully
An offline result can be a reason to test a visible axe; it is not evidence that one named axe is globally best. Keep the same time window and record the name shown in-game before comparing.