Boromirs way?

[Mithalwen]

In the journeys of Frodo, Barbara Strachey says " There is conflicting evidence on the overall distance involved. In Unfinished Tales it say sform Osgiliath to Bree via Tharbad was 392 leagues and from Bree to Rivendell 116 leagues. The latter presents no problem, but ...the distance from Osgiliath to Bree is improbably long..I cannot reconcile this with the many other measurements provided.

Incidentally Boromir claimed to have travelled 1200 miles ... but it is not at all clear which route he took. He must have gone through Tharbad.....it is possible he took the road the whole way. HE may, however, have gone up the Hoarwell to the last bridge, though without a horse he would have found it difficult to carry enough food, while if he had gon up the Bruinen he would have had to cross the wild fenlands of Swanfleet and the River Glanduin"

Clearly not an easy journey and since his horse ran aaway rather than died he may have lost a lot of his food and gear. Ill equipped and on short rations, you won't make good time....