Levelplot too many labels {rasterVis}

Hello there,
is it possible to dimish the amout of labels inside {rasterVis::levelplot}?
I do not want to aggregate the raster, just get rid of overlaying labels...

Until now, i haven`t figured it out... so it looks like this:

here is some example code...

 levelplot(
                r1 ,
                contour = TRUE,
                labels = TRUE) ```

Greetings 
Chris