Answer:
Over the economic life of the asset.
Step-by-step explanation:
An asset obtained under a financial lease must be depreciated in the same way as the company would depreciate any other similar fixed asset. E.g. a leased truck should be depreciated similarly to other trucks owned by the company.
In a financial lease, the lessor amortizes the asset's value, while the lessee depreciates the assets as common fixed assets (a lessee doesn't amortize).