An oftentimes phrase is used to show that something happens frequently or regularly. You hear it often when people talk about common problems.
When someone says "I'm running late oftentimes," they mean they have trouble getting somewhere on time a lot, not just this once. If you ask a coworker if their boss yells at them, and they reply "Yes, oftentimes," that means the yelling is a normal part of the job for them.
many times at short intervals
Example: we often met over a cup of coffee
