Hi @rsg , if I undestand well, you need use xlim and ylim, but this depend the lenght of the data.
For better help you, remember put a reproducible example of his data. Is easy with dput() .
levelplot(mydata, scales=list(x=list(at=seq(0,648,48), cex=1)),
xlim=c(0,5000),
ylim=c(0,5000))