Graph not displaying all the data over a period of time


I need to measure the temperature over a specific time. The temperature gets stored about 20 times per second. When i display the graph for about 30mins, it doesn’t display all the data.
Now there is a field “Max data points” which i can set to 9999999 which will allow me to display the data for this timespan, but i wondered if there was a better way.

I’m using Google BigQuery and i haven’t found anything to solve this problem.

This is how it looks when i dont set the max data points: