CREATE TABLE table_28994 ("Dibrugarh" TEXT, "Kanyakumari" TEXT, "Vivek Express /15905/15906" TEXT, "Indian Railways" TEXT, "4286km" TEXT, "55" FLOAT, "Weekly" TEXT, "82.30 hrs ( ~3.5 days ) " TEXT)

How long does the 2579km route take?
SELECT "82.30 hrs(~3.5 days)" FROM table_28994 WHERE "4286km" = '2579km'
SELECT "82.30 hrs(~3.5 days)" FROM "table_28994" WHERE "4286km" = '2579km'