The ECB have revised their guidance for young, fast bowlers. The full details can be found at Fast bowling directives change for 2010.
The summary is:
AGE: | MAX. OVERS PER SPELL | MAX. OVERS PER DAY |
Up to 13 | 5 | 10 |
U14, U15 | 6 | 12 |
U16, U17, U18, U19 | 7 | 18 |
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The ECB have also said that it is recommended that in any 7 day period a fast bowler should not bowl more than 4 days in that period and for a maximum of 2 days in a row.