How long should a female testosterone cycle be and what ng/dl should I aim for?

Currently been on T for a month and at 450 ng/dl according to recent lab taking 7.5 GM gel. Not experiencing any noticeable effects yet positive or negative but recognize I’m above normal range for a women. Aiming for weight and muscle gains ok with slightly lower voice and increased hair but not too much. Do not want changes to face or hair loss. Doctor said my absorption is unusually high so thinking I should go by ng/dl level rather than dose.

What ng/dl level should I aim for?

How long should I continue?

When do you start seeing gains?