It definitely (and obviously) depends on the school - I got a Downstate, Georgetown and UPenn intervew invite last week and they're scheduled for 2.15.05, 2.04.05 and 1.12.05 respectively. I think a lot of schools are scheduling out 1 - 1.5 months, but others are scheduling near April (Drexel)...
Any schools about which you're particularly concerned?
Happy New Year, too!