I use paper charts, nearly never draw on them so they are good for years (until they start cracking at the folds).
Frequencies are already supplied on them, so the only info I write on a piece of paper are the headings (if it is a long flight with twists and turns)and calculate the flight times between points while flying.
In Italy ATC always wants your estimated time over the VRPs so you are always calculating time to next point.
Ciao,
AE