My boys ate 18 months and 4 days apart!! I love it, was blooming hard work especially first 6 - 8 weeks (added extra of CS recovery). DS1 was not walking till 21 months so that made it hard as had to carry him as well as baby whom I had in a close carrier a lot of the time.

At feed times I would make sure DS1 had food and drink and or DVD or tv show to watch, I also had some toys just for feed times that I could help him with 1 handed or read a book.

You learn not to worry about messy house and things not done. DS2 was much happier to be put down on floor or in swing while I sorted DS1 out that DS1 was to wait.
i also tryed to make sure DS2 was due a feed after DS1 was in bed for arvo nap which was 1 till 2 - 4 depending until he went into a bed and stopped napping at 25 months.

I was out and about early on with both in pram as I could not drive die to CS, I caught train to city and went to aquarium when DS2 was 3 weeks old!!

I don't think there is any right or wrong gap it depends what works for you.

My 2 boys now play together (not always nicely) and its very cute to see DS1 giving DS2 cuddles and kisses and sharing when he feels like it.

Good luck