Rahu Kaal timings and duration aren't same for almost any two areas due to difference in community timings of dawn and sunset. Even for one area Rahu Kaal timing and length will not be very same for all times as dawn and sunset timings keep transforming throughout the year. https://remingtonpxvni.nizarblog.com/25378926/considerations-to-know-about-kaal-bhairav-mantra