No. Keep it to 8 weeks or less.
If you want to know more; There’s no question vyvanse adderall etc cause cardiac stress through elevating blood pressure and heart rate, we just don’t know the 20-30 year effect yet.
Steroids don’t increase catecholamine release but can increase blood pressure or heart rate through a few mechanisms. You would be concerned here about overlapping stress between the two drugs.
Blood pressure is mostly related to fluid retention and/orincreased body mass which can influence a part of blood pressure called afterload (mostly related to increased size and systemic resistance). The latter of which could reflexively increase your heart rate as well. Not sure what your goals are but it sounds like mass is not one of them. So I wouldn’t be too concerned. Anavar being a DHT derivative wouldn’t cause much fluid retention. DHT derivatives can seemingly upregulate t3-t4 conversion, essentially utilization of t3 which can occasionally elevate HR further, but this is rare and unknown if it is actually true.
Your cholesterol may be temporarily affected, but this is a “down the line” worry... alternatively run red yeast rice (essentially pravastatin) and possibly niacin (although niacin has shown really not to benefit anything and remains controversial from a cardiology/lipidology perspective. This however has nothing to do with the vyvanse/AAS combo.