While this is not a hard and fast rule, these recommendations work.
Small scale figures – 10/15mm playing with a 10cm grid on a 4’x3′ table – use 1500 – 2000 pts. Using a 15cm grid we recommend 1500pts
Larger scale figures – 25/28mm playing with a 15cm grid on a 6’x4′ table use 1500pts. If you have the room to play on 8’x5′ then you may try 2000pts
These give a game length of about 2 hours. Armies on average have 10-15 units including Generals
To play doubles we recommend each player using 1000pts of the same or allied armies.