Saw some samples online but they are just for LEDs not Servos.
Those examples you found are showing you how to do anything at times intervals. The fact that they use an led and you want a servo means nothing. Instead of turning on an led you want to run a servo. So instead of putting led code inside that if statement that checks agains millis put your servo code.
Also how may I manipulate the time intervals? Would that be in seconds?
The function is called millis. Think about that for a little bit. What time unit do you think it uses? If you're still not sure then look that function up. You can read documentation. You're not helpless. But really the name should just give it away.