How much pumpkin seed oil can you take daily for depression?

None. : There is no evidence that punpkin seed oil or omega-3 oils impact depression. The amount of omegas in pumpkin seed oil is very low anyway. No other nonculinary benefit to their use.

L-tryptophan: The speculative reason to take pumpkin seed oil for depression is that it contains l-tryptophan, an amino acid. Pumpkin seed oil has not been studied in depression, to my knowledge but l-tryptophan has been studied at 300-4000mg per day. Since only a very small amount of l-tryptophan is available per gram of oil, it is not worth it to take the oil. Better to just take l-tryptophan directly.