I changed it to

```php
public static function hexColor()
	{
		return sprintf('#%s%s%s%s%s%s',
			dechex(static::numberBetween(0,15)),
			dechex(static::numberBetween(0,15)),
			dechex(static::numberBetween(0,15)),
			dechex(static::numberBetween(0,15)),
			dechex(static::numberBetween(0,15)),
			dechex(static::numberBetween(0,15))
		);
	}
```

And now it takes
0.99022912979126 on my raspberry