There's usually only one way to find out, just doing it. There's a gazillion factors involved like the disk type and read/write speeds, the underlying database engine and how it's been tuned, if there's other IO-bound operations going on at that same time, running virtual or not, multi-master clustered stuff etc. etc.

The only thing you can do is run it on a decent set of data on a not too overpowered machine and see how long it takes...