[Vocabulary] What would you call someone who's watched a show for a very long time?

I'm thinking about "a perennial/long-time/long-standing/seasoned/veteran spectator/viewer" or "a veteran". Although I speculate that "a loyal spectator/viewer" might suffice, I'm looking for terms that stress the long time period.
Do you have any suggestions?
Thanks so much.

Fan.

MikeNewYork said:

Fan.

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NOT A TEACHER
I could watch "Who Wants to Be a Millionaire" for only a month and become a big fan of the show. Am I wrong?
What I really need are some terms that emphasize the long time period.
Anyway, thank you for your answer.

The word "fan" is not about a time period. One can be a fan for a month or for several years. It has to start somewhere.

Obiter, I've just updated some new terms I can think of to the original post.
NOT A TEACHER

khanhhung2512 said:

emphasize the long time period.

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Does 'permanent' work?
Not a teacher.

A long-time fan.
A long-standing fan.
A fan from/since the very beginning.

devotee
addict
junkie
aficionado
fanatic

NOT A TEACHER

emsr2d2 said:

A long-time fan.
A long-standing fan.

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How about my suggestions? Are they OK?

khanhhung2512 said:

I'm thinking about "a perennial/long-time/long-standing/seasoned/veteran spectator/viewer" or "a veteran". Although I speculate that "a loyal spectator/viewer" might suffice, I'm looking for terms that stress the long time period.

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Here's an example I've found for "perennial".
William Walls III, once an aide to Mayor Washington, is a perennial candidate. (New York Times, Feb 17, 2015)
http://www.vocabulary.com/dictionary/#word=perennial

As a side note, in my opinion, some people can follow a show for very long time, and still are not really fans.

Rover_KE said:

devotee
addict
junkie
aficionado
fanatic

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I think what I really need are words more neutral which mean "someone who's watched a show for very long time" only. Although "veteran" and "seasoned" imply "experienced", I surmise that "someone who's watched a show for very long time" can justifiably be considered as "experienced".
Am I wrong?

I don't see "long-term" yet. That's what I'd choose, over "long time".
"I'm a long-term fan of X."

But some nouns don't go well with some adjectives. Eg, "I'm a veteran fan" is not as good as "I'm a veteran viewer/watcher." Others might have different preferences.