Originally Posted by SonnyWimps
How long exactly does a mare stay in heat?
Varies from mare to mare...cycles are 18-31 days (roughly), with 3-8 days where she is receptive to the stallion (will stand for him.) Stallions usually show interest just within that 3-8 time period, but others, especially ones that run with a herd, will show interest for much longer periods of time. That's the testosterone and the stallions need to protect his gals for survival!
You might want to find a good stallion trainer to help you redirect his attention and focus to listening to you.