Will this hurt my eyes?

When I got my contacts (Mediflex Aquafinity... or Aquifinity, I don't know which), my eye doctor told me to only wear them for twelve hours a day. But, honestly, this is so not realistic. I am awake for at least 14 hours a day. Will it hurt my eyes to wear them longer? It's not uncomfortable from experience, and if they do get uncomfortable, I'll take them out. But, I just want to know if this will hurt my eyes, because, I hate having to wear my glasses half the day and my contacts half the day. Thanks.