There is no set recommended number. It depends on a lot of factors, such as having a lot of jungle to clear out.
However, I tend to build a LOT of workers up front - 2 to 4 per city for the first 3 or so, then 1-2 for the next couple of cities. After that I usually don't have to make any for a long time, or even the rest of the game unless my territory gets pretty large.
If I have a lot of jungle I might make a few more, since it takes longer to clear, and that alone can get you ahead of the AI if he also has jungle. On a game I am still playing, I made *8* workers for the first 2 cities. Only an hour or so into it, but from a slow start it seems to be ramping up very very fast now - I went from #8 to #3 in about 6 turns.
I would say by game end I have between 10 and 20 workers. Every game is different, but for me at least, it seems to work best to get a lot of workers out early.
However, I tend to build a LOT of workers up front - 2 to 4 per city for the first 3 or so, then 1-2 for the next couple of cities. After that I usually don't have to make any for a long time, or even the rest of the game unless my territory gets pretty large.
If I have a lot of jungle I might make a few more, since it takes longer to clear, and that alone can get you ahead of the AI if he also has jungle. On a game I am still playing, I made *8* workers for the first 2 cities. Only an hour or so into it, but from a slow start it seems to be ramping up very very fast now - I went from #8 to #3 in about 6 turns.
I would say by game end I have between 10 and 20 workers. Every game is different, but for me at least, it seems to work best to get a lot of workers out early.