How to decide learning rate, number of mc objects and iterations in ADVI?

Questions v5
1

I am using ADVI to find optimal parameters using the below code

with mod:
    inference = pm.ADVI()
    tracker = pm.callbacks.Tracker(
    mean= inference.approx.mean.eval,  # callable that returns mean
    std= inference.approx.std.eval  # callable that returns std
    )
    approx = pm.fit(n= 20000, method=inference, callbacks=[tracker],obj_optimizer=pm.adam(learning_rate=0.0005), obj_n_mc=2)

-log(loss) looks like
loss

20,000 iterations took 24 hours to run on a 16 CPU machine, the final parameters are close to the ground truth values though. I wonder if I can have a better learning rate, obj_n_mc and number of iterations? The loss looks too noisy and 24 hours is a lot. I tried increasing the learning rate but did not help.