Length Of Makruh Times Of Salah
Principle is that no Salah should be offered or prostration done at the exact moments of Sunset and Sunrise. Extra15-20 minutes before and/or after are timings of caution . But the actual happening of sunset and sunset to the best of my knowledge do not take that much time. As a rough average you can say 2 to 5 minutes ( the exact timing depends on certain factors ). The rest is a matter of application and a matter of caution. It’s upto the individual howmuch cautious they want to be while applying this principle. Please also see : Discussion 1626
JazakAllah for follow up