It varies Widely depending on your point A and your point B, how one plans to get from one to the other, and your priorities. (Is it ESSENTIAL to you to be FIRST-ish to enter the park?)
If you are going to HS/Epcot from an Epcot deluxe, the walk part is under 15minutes, plus however much time you want to allow for security and such.
If you are taking the bus, coming from one of the big moderate hotels, it is Thanksgiving/Easter/Christmas week, and you aren't able to walk the main bus stop, and arriving before the parks open is a big priotity, then many folks allow well over an hour (two?) to get to the park form their hotel. I haven't taken a bus from one of the mods in quite some time, so I'm not a good person to answer this.
if you have your own car, that's another big variable.