How long does GWMME migration take when migrating 500 users with each of them having 3 GB of data (so around 1500 GB of total data) from Microsoft Exchange 2019 to Google Workspace if I install the GWMME on a Compute Engine VM as a client machine with an 8-core CPU and 16 GB of RAM? or perhaps there is another recommendation for the GWMME client machine specification with that amount of user and data, thanks.