Question

under ideal conditions, bacteria can double: every minute every 15 to 20 minutes every 2 hours every 24 hours

Explanation:

Under ideal conditions, bacteria reproduce by binary fission. Different bacteria have different generation times. Generally, many common bacteria can double every 15 - 20 minutes under ideal conditions. Bacteria cannot double every minute as their metabolic and replication processes take some time. Doubling every 2 hours or 24 hours is much slower than the typical reproduction rate of bacteria under ideal conditions.

Answer:

Every 15 to 20 minutes