The ITV show Hornblower starring Ioan Gruffudd had 3 series (a total of 8 made-for-television movies).
Hornblower The Examination for Lieutenant - 1998 TV is rated/received certificates of: Singapore:PG UK:PG
Hornblower Loyalty - 2003 TV is rated/received certificates of: Australia:M Singapore:PG UK:15
Thunderboat Row (1989) is a made-for-TV movie, not a series or mini-series, and therefore was not continued.
There were 10 series of the Spooks TV series. The first series comprised of 6 episodes, 2nd - 6th series had 10 episodes, 7th - 9th series had 8 episodes and the final 10th series had 6 episodes.
There is no specific number. It all depends on what shows are good. Should a bunch of new series come out on year that nobody likes, many new series will come out to follow. That year, there would be many TV series. However, a year that has many great TV series that everybody watches would have little new series, thus having less TV series that year.
As of my last knowledge, there are no official plans to continue the Horatio Hornblower series. The series was based on the novels by C.S. Forester and was adapted into a successful television series starring Ioan Gruffudd. While there is always a possibility of a revival or continuation in the future, there have been no recent announcements regarding new adaptations or sequels.
Hornblower The Examination for Lieutenant - 1998 TV is rated/received certificates of: Singapore:PG UK:PG
Hornblower The Even Chance - 1998 TV is rated/received certificates of: Argentina:Atp Singapore:PG UK:PG
Hornblower Duty - 2003 TV is rated/received certificates of: Australia:M Netherlands:12 Singapore:PG UK:PG
Hornblower The Frogs and the Lobsters - 1999 TV is rated/received certificates of: Netherlands:12 Singapore:PG UK:PG
Hornblower The Duchess and the Devil - 1999 TV is rated/received certificates of: Netherlands:12 Singapore:PG UK:PG
Hornblower The Duchess and the Devil - 1999 TV was released on: UK: 24 February 1999 USA: 18 April 1999 Japan: 9 September 2002
176 Films and TV Series were made about WW1
Hornblower Loyalty - 2003 TV is rated/received certificates of: Australia:M Singapore:PG UK:15
Thunderboat Row (1989) is a made-for-TV movie, not a series or mini-series, and therefore was not continued.
There were 10 series of the Spooks TV series. The first series comprised of 6 episodes, 2nd - 6th series had 10 episodes, 7th - 9th series had 8 episodes and the final 10th series had 6 episodes.
The Kung Fu television series starring David Carradine aired in the United States from 1972 to 1975. There were a total of 63 episodes of the series.