How many acres is a velodrome?

Excuse me, but I was wondering if you could clarify something for me. I've been doing some research on velodromes, and I came across the question of how many acres they typically cover. I understand that the size can vary depending on the specific design and purpose of the velodrome, but I'm trying to get a general idea. Could you perhaps provide a rough estimate of the acreage of a standard or typical velodrome? Thank you in advance for your assistance.