How many EFS file systems can you create per AWS account per region by default, and how can you increase it?

What is the maximum file size supported by EFS?

You have a small EFS (50 GB) but need high sustained throughput.
Which throughput mode allows this without growing file size, and what’s the cost implication?

What’s the difference between EFS and FSx for Windows?

Can EFS be accessed from on-premises systems?