Posts should be as long as you can possibly make them with plenty of description as this will help the next person, or yourself reply. Those at theremainingrings understands that you can have a bout of writer's block when people post extremely short posts, so rambling is welcome here on the site as long as your spelling and grammar is correct.
Remember...
When people speak, a new line for each spoken sentence.
Eg 1. "Indiana! That's a woman's purse!" "No! It's A SATCHEL!" (This is bad!)
Eg 2.
"Indiana! That's a woman's purse!"
"No! It's a satchel!"
^ Example 2 is the way it should be laid out. Please also remember your commas, full stops and capital letters. We aren't grammar Natzi's but please do your best to keep up to date, if english is your second language then please let the person you're posting with know. But the overall minimum is 50 words.