How long does it take to bake a meatloaf at 200 degrees that should be baked at 350 degrees for one hour?

1 hour at 350,

1 hour 20 min at 300,

2 hr 20 min at 250, and

5 hrs at 200.

slow cookers generally operate at 200 degrees, the difference between high and low settings is only how fast it heats up to 200.

for beef generally figure 15 min/lb, at 350

20 min/lb at 300

35 min/lb at 250

and 75 min/lb at 200