This is somewhat late, but the Wikipedia page has aggregated some of the main techniques for quantum Hamiltonian simulation.
If you're looking for a bit more of a walkthrough (over scientific papers), Microsoft provides a good overview of both Trotteriation / Qubitization. IBM also talks about VQEs.
@Cryoris answer is perfectly valid, but a more "Pythonic" way of doing this is with the help of the with keyword:
# Run VQE here, respect the identation.
# /!\ At this level of identation, warnings are no longer ignored....
You can add the following before running the VQE to suppress the deprecation warning
# run VQE here
That turns all the deprecation warnings off, if you want to turn them on again you can add
I don't think there is a ...
As it is said in the comment of your question, a good reason for this may be that for larger molecules it will have to take more time to solve the problem.
If you want to see your job status or monitor it, you can try to use the method job.status() (see details here) or try the job monitor, you can see if it fails or if it runs with those.