What time of day do bucks usually rub there horns?, or do they do it randomly whenever. I see alot of rubs in the area where my stand is but never seen or heard them rubbed.

Well bucks travel at all times of the day, and night. So they can make rubs at anytime. I've seen bucks make rubs at different times during the day, so really don't think theirs a specific time of rubbing. They do say scrapes are made mostly at night. I know scrapes I've doctored up have been visited at night on several occasions.