Amanada White - 200 hours en-route to 500
The Buddha reminds us of the right approach in his famous metaphor of the raft from the Majjhima Nikaya.
In it, he describes a situation, where a man standing on the near shore, which is dangerous, needs to get to the far shore, which is safe.
There are no bridges or ferries so he builds a raft; it is not fancy, but adequate to get him across. Once on that far shore it has served its purpose, and a wise man leaves it where it is, without dragging it with him as an encumbrance.