You are able to very quickly acclimate to cultures from periods other than your own.  15 minutes of conversing with a native of any time period who speaks a dialect of a language you know either derived from the one known by you -or from which your dialect was derived- results in you becoming fluent in the new future or ancient past dialect.  Spending one hour studying a document written in such a dialect allows you to read and write in that dialect afterward.  This time is reduced by half if you've become fluent by conversing with a native.  Additionally, spending an hour immersed in a foreign culture allows you to check Int (Investigation) for contemporary cultures, Int (History) for past cultures, or Int (Future History) for future cultures, to figure out the time period you are in.  Using the wrong check will grant accuracy from the millenium to the century.  Using the right check will grant accuracy from the century to the decade.  DM's decision on specific accuracy of all time estimates, as some decades saw lots of change, and others did not.  If this check is failed, it may be attempted again after each additional hour spent immersed in that culture.  Spending a full day there allows you to pick up customs relating to etiquette, law, and commerce.  Any penalties due to prejudice or ignorance that normally applies to foreign visitors to that culture no longer apply to the Traveler.