There are 60 minutes in 1 hour.
If each actor performs for approximately 15 minutes, then there can be 60 / 15 = 4 sets of 5 actors in 1 hour.
Each set of 5 actors performs for 15 minutes, so in 1 hour, there can be 4 sets of 5 actors = 4 * 5 = 20 actors.
Therefore, there can be 20 actors on the show in a span of 1 hour.
#### 20
The answer is: 20
Below is a math problem. Provide a detailed, step-by-step solution.

### Problem:
If there can be 5 actors at a time in a show, and each actor performs for approximately 15 minutes before being replaced by another 5 actors, how many actors can there be on the show in a span of 1 hour?

### Answer:
