Rabbit Hole (time portal)

The Rabbit Hole is a time portal located in the pantry of Al's Diner, a restaurant in Lisbon, Maine.

Laws of Time Travel
Al Templeton discovered the rules of the time portal as he journeyed back and forth across time:


 * Every journey through the portal transports the traveler to October 21, 1960, at precisely 11:58 AM.


 * No matter how long someone stays in the past - hours, days, weeks or years - only two minutes elapse in 2016.


 * Past events can be changed. However, subsequent use of the portal "resets" the timeline and nullifies all changes made on the previous excursion.


 * The "obdurate" past throws up obstacles to prevent history from being changed. Such resistance is proportional to the magnitude of the change. ("The Rabbit Hole")

Etymology
"Rabbit Hole" refers to the idiom, "go down the rabbit hole". It means to enter into a situation or begin a process or journey that is particularly strange, problematic, difficult, complex, or chaotic, especially one that becomes increasingly so as it develops or unfolds. It is an allusion to "Alice's Adventures in Wonderland" by Lewis Carroll.