I set a kitchen timer to 12 minutes for each floppy disk's worth of download at 14.4k. It took many evenings of interrupting my TV watching every 12 minutes to kick off a new zmodem download. If it was indeed 30 disks (which seems reasonable; some of the disksets were only 3 or 4, others were 8 or more, depending on which packages you wanted), that would have been 6 hours in one shot with no overhead.