Short answer:
More than you would need for just about any experiment.The internal memory allows you store a lot of data, both in one file, and across many files. Since data files take up very little storage compared to pictures, we have not seen the amount of memory in LabQuest as a limiting factor for most classroom and lab experiments.

Long answer:
The maximum number of points that can be collected depends on the available internal memory^ as well as the number of data columns used in the collection. There is no fixed or hard coded maximum number for LabQuest. You can estimate the maximum number of data points using the information below.

The maximum number of data cells (table entries) that can be stored (assuming no limits to memory) depends on which LabQuest device you have.
> Original LabQuest = 64,000
> LabQuest 2 or LabQuest 3 = 380,000

To determine the maximum number of points that can be collected, divide the maximum number of cells by the number of data columns needed for data collection.
> For a single voltage probe, you need two columns (Time, Voltage), so the maximum number of points = max cells/2.
> For two temperature probes, you need three columns of data (Time, Temp1, Temp2), so the maximum number of points = max cells/3.
> For a motion detector, you need four columns of data (Time, Position, Velocity, Acceleration), so the maximum number of points = max cells/4.

When setting the data collect Rate and/or Duration, the LabQuest software will calculate the number of cells needed and check to see if there is enough available memory to complete the data collection. If the number exceeds the available memory, an invalid entry error message is displayed in the data collection dialog.

Note: When collecting more than 10,000 points, regardless of the number of sensors or data columns, there will be an impact on the LabQuest App performance. You can still collect data; however, you should expect delays in displaying data on the graph making the App at times appear to have stopped working.

^ the amount of available memory is based on internal memory only and is not increased when using a USB flash drive or SD card.