It will usually just take a few minutes to process your data. Large Data CSV files will take longer to upload and process depending on the number of rows of data and columns of fields. Many rows and many columns equal a larger file which takes more time to upload and process along with all the existing data in your account. High system activity can also affect processing times. After you activate your data sheet we'll display the Virtual Data Master progress up to 100% so you'll know when it is complete.