How long for 1.5 lb English beef roast?

For a 1.5 lb English beef roast, cooking time will typically range from 1.5 to 2 hours at a temperature of 325°F (163°C). For medium-rare, aim for an internal temperature of 135°F (57°C), while medium should be around 145°F (63°C). Always let the roast rest for about 10-15 minutes after cooking before slicing to allow the juices to redistribute. Use a meat thermometer for the best accuracy.