By surfing 10 - 15 different TE's everyday, you will end up surfing at 70 - 150 traffic exchanges every week. This is based on 7 days. Now you don't have to do this all 7 days, adjust it to fit your needs. Learn how to effectively utilize traffic exchanges to your advantage by clicking HERE.
My favorite with the shortest timer is Traffic Marketplace. I also like Mobile Views because you don't have to be logged in to surf and you can surf on a mobile device.