Answer

In Jain tradition, Gautama Buddha is not described as having formally practiced Jain Dharma for a specific number of years.

So the accurate answer is:

Sorry, I can only provide information that is clearly established within Jain tradition.

Explanation

Some historical discussions compare Buddhism and Jainism because both traditions arose in ancient India and both emphasize renunciation, non-attachment, karma, and liberation. However, within accepted Jain tradition, there is no clearly established teaching that gives a definite period during which Buddha “practiced Jainism.”

Takeaway

Jain Dharma should be understood on its own terms through the teachings of the Tirthankars, especially Bhagwan Mahavir in the present time cycle.