Wait longer for vm to boot

Because we're generating certs.
Is this a Windows-specific problem (just a guess)?
So now if there is a real problem with the VM, everyone will have to wait 18 seconds to find out about it instead of 9 seconds?
Instead, could we do something like:

```go
n := 30
if runtime.GOOS == "windows" {
        n = 60
}
for i := 0; i < n; i++ {
...
```