Doc John,
I am guilty to sometimes not want to bring a post to the top, but like to update it. The unlimited feature allows me to do this.

Also, sometimes information is updated, or should I say out dated in the science world. The unlimited feature has allowed me to update new links, new information for those that even years from now could access.
What is the practicality of a 90 minute?
Liuke the one poster above, sometimes it takes several tries to correct typos in a high pain mode, or fingers ae buzzed out.

Sometimes I even linnk back to a post that I see is not sounding like I meant it to...I would drive the moderators NUTS to help me correct or update.
Just my thoughts,
Dianne