To answer this question, we need to understand the relationship between the time the hare and the tortoise have been running. Since the question doesn't provide specific details about when each started running or their speeds, it's impossible to determine exactly how long the tortoise has been running based solely on the given information.

Please provide additional context or details, such as:

• When did the tortoise start running relative to the hare?
• Are they running at the same time, or did one start before the other?

With this information, I can give you a precise answer.

Would you like more details on how to solve this, or do you have any other questions?

Here are five related questions that might help clarify the problem:

1. What are the speeds of the hare and the tortoise?
2. Did the tortoise start running before, after, or at the same time as the hare?
3. Are there any given distances for the hare and the tortoise?
4. Is the hare's time relevant to the tortoise's time?
5. Are both the hare and the tortoise running a race with specific start and end points?

Tip: When solving problems involving two moving objects, always pay attention to when each object starts and their relative speeds or times.