It’s also my advice. BUT what I learned is, with an interface as master clock in most cases it takes the sample rate selected in the DAW. With an external master - the Saffire in this case - you have to be aware to set both, hardware and software to the same rate. I don’t know what system (Mac/Win) and DAW you use. On Mac with Logic I once had the issue with annoyingly long times to create a new project. I then realised, it’s only like this when I have my Fireface slaved to an ADAT preamp. After setting it to internal/master clock, all went well again.