Swapping discs or mandatory installs? What's worse?

[Rath]

Depends, how long is the install and how often do I have to swap disks?

If the install takes a minute then I'm okay and if I have to swap disks every 10 hours then I don't care. However if it's a thirty minute install or I have to swap disks every hour then I'll get annoyed.

Edit: However during game installs (if not hidden during gameplay or an interesting cutscene) are the worst. It takes far longer than swapping a disk does.