@joedude97  
Nah, it’d be split into several short stories and comic strips, feature pages, adverts and stuff. Comic № 5, for example, is 16 pages long. Stories and strips sometimes continued over 3 or 4 issues in the later numbers.
 
Example issue: № 5 “Merry Music”
 
pp. 1-3: cover and one-off comic strip Merry Music  
pp. 4-5: one-off comic strip The Silver Challenge Cup (ft. best pony Lemon Drop!)  
p. 6: Advert for Disney Magazine  
p. 7: Your Own Page, a regular feature (“send your letters, pictures and puzzles to your favourite pony”)  
p. 8-9: picture story The Uninvited Guest (an insight into Twilight’s powers, recommended)  
pp. 10-11 one-off comic strip Pantomime Parade (simple story, but really cute)  
pp. 12-13 one-off comic strip Spike is Naughty  
p. 14 Advert for the Dream Castle playset with Majesty (A Royal Pony’s Home is Her Castle)  
p. 15 Early-issue regular feature Welcome to Ponyland (Poems about ponies. “My name is Sunlight…”). This one is really wholesome.  
p. 16 back cover “Powder’s Corner”. The “<pony>’s corner” things were recurring features too. Activities for kids and write-ins.

The entire comic was only three pages long?

@WingbeatPony  
Limey git here, can confirm. Fortnight is a normal, current, useful word over here. It doesn’t sound quaint or archaic or anything like that. Good for holiday lengths, regular payments, sporting fixtures, and other things that happen in alternating weeks.
 
Seems weird to me that the Yanks seem to have lost it, and then have had to come up with the ambiguous muddle of “biweekly” as a stopgap. Maybe it’s worth reimporting? After all, I’m openly choosing to steal back -ize endings for technical words with Greek roots, and we’ve been able to make useful program/programme distinctions over this side of the pond since the 80s or earlier.

Every fortnight! I don’t know if I’m surprised by the actual unit of time - imagine something being released once every two weeks these days - or the use of the word “fortnight” in 1985. Then again, this was printed in the UK, maybe the word hasn’t fallen out of fashion there.