The amount of data that can be downloaded is dependant on a number of factors. The primary consideration needs to be the size of your page file. For this application, bigger is better. Other open applications will also reduce the available memory so this needs to be taken into account. Time is also a factor. A large number of records with only a few fields will download much faster than a large number of records with many fields. Additionally, it is best to filter the record selection wherever possible so as not to download unnecessary data. If you intend on analysing the data in a spreadsheet then you need to be aware of the row limitations. For example, Excel has a limit of 65,536 rows and 256 columns.