Python Pandas- Increase Xtick frequency without matplot

Question

is there a way I could change my xtick frequency without changing my code too much?

ax = pred0x.plot.line(x='time', y='load', figsize=(200,100), fontsize=100, color='red', rot=90)
ht1.plot.line(ax=ax, y='load',figsize=(200,100), fontsize=100, color='green',rot=90)

1. I checked the library for plot.line without success
2. I know it is possible to do it with matplot but matplot doesn't seem intuitive for me. But if it's the only way there is another challenge waiting for me: How do I plot two different csv files on the same line plot?

Thank you very much!