Combat encounters per adventure

I am working on a conversion of a classic Dungeons & Dragons adventure module to today's 4th edition D&D. And that conversion process really makes some of the changes from previous editions to 4th edition very clear, with the key factor being the number of combat encounters in the adventure. I have one old module with 54 combat encounters, and I am trying to condense that into a 4th edition adventure with about 10 combat encounters. While keeping the same amount of story and roleplaying

World of Warkraft...