I've done it twice and each time it only took about 5 minutes. The first time it started immediately after I did the checkswitch, IIRC, once I read the cautionary note and "selected" to proceed. On the second try (new receiver) it hung-up on the D/L, evidenced by no advancement on the progress bar. I waited about 5 minutes, then did a hard reboot (pulled plug). I had read in one of these threads that if it hangs, you should do that rather than wait forever. It worked for me! YMMV. (Great forum for these little tid-bits...!)