Oil change by time

[signals34]

I heard 6 months is the longest you should leave the oil unchanged if your mileage is low...I put on about 2600 miles on my H-3 in 12 months....I always check it and it never burned and it was still clean so I just changed the oil now, at 12 months...I was wondering if there was a set time schedule if there are few miles being put on...and no ,the "change oil" engine oil life did not come on...