@overthehill, Not all cancerous nodules are fast growing. There are many different types of lung cancer; some are slow growing, and some can be more aggressive. The makeup of the nodule (solid, subsolid, and ground glass) points to how it appears on the scan, but it doesn't tell us if its cancer. All of those types can be benign or cancerous. Sorry, I know that's not very helpful, but it's the way our bodies work. The spiculation can lean toward cancer, but that could just be the way this one scan looks and what one radiologist sees.
It's not unusual for doctors to rescan in a few months. Biopsy comes with risk, and they don't want to put patients through that unless they have to.
One thing that I've found is that our lungs can take a long time to clear out inflammation, infections, or other non-cancerous tissue. We'll be long past our illnesses, but those pesky nodules still show up in our lungs. I'm not diminishing your concerns, just trying to reassure you that waiting is not unusual.
https://www.mayoclinichealthsystem.org/hometown-health/speaking-of-health/understanding-lung-nodules