How many days did the disciples spend in the upper room before Pentecost?

We’re not told in the Bible exactly how many days the disciples were in the upper room before the Day of Pentecost. However, when Jesus was with them He said, “For John baptized with water, but in a few days you will be baptized with the Holy Spirit” – Acts 1:5. It took less than a day to get to Jerusalem (a “Sabbath days walk” – Acts 1:12), so the time spent in the upper room would have been no more than a day or two and certainly less than a week.