Post #21, in the UK at the northern most extent of it's orbit (ISS is in an orbit inclined to 50 something degrees) it takes several minutes from appearing in the west to setting* in the east, but can be quite hard to spot until it's overhead, at which point it is easy to track by eye until it sets. The timing shouldn't vary much when seen at other latitudes, the ISS's orbit is not particularly eccentric so doesn't get further away and slower/closer and faster at any location along the orbit.
*you'll only see it in the hours before dawn or after dusk while the sun is down from where you are standing on earth but still illuminating the ISS some 300km above your location.
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