I still remember how many minutes it took to boot WordPerfect on the schools 486DX2 66Mhz ... I could time it to play a round of doom on another machine next to it.
I'm guessing that was loading over the LAN, as that's the only time I recall seeing multi-minute load times on a DX2. In that scenario, the speed of the computer was largely irrelevant, as files were being pulled from a NetWare server (reading files of very slow spinning disks) over a 10Mb shared media ethernet network.