As many as the fielding team takes to get out the batters or until the batting team declares.
If there are no extras, then only 30 balls will be bowled. If there are extras, more balls will be bowled depending on the number of extras.
By illegitimate, I presume you refer to a no-ball or a wide. Under current rules an over contains 6 balls. Some years back, 8-ball overs were used in Australia if nowhere else. For an over to be complete, 6-balls not including a wide or no-ball must be bowled. If an illegitimate ball is bowled, it must be rebowled. The most illegitimate balls bowled in one over was an over bowled by Curtly Ambrose in his final test on Australian soil which contained 9 no-balls - a total of 15 balls.
6
Six
3
There are six legal balls bowled in one over, meaning that their has to be six balls which are not deemed to be no balls or wides.
Sixballs to an over.Historically, this number has changed over time, starting with four balls to an over, then growing to five in 1889 and to the modern six in 1900.Sporadically throughout the 20th century, eight-ball over had been trialed, but the practice was eventually abandoned, and as of 2000, the Laws of Cricket specify a six-ball over.
In cricket, an over consists of six legal balls bowled by the bowler to the batsman. A total of six balls are thrown in one over unless there are wides, no balls or other infringements that result in additional deliveries being bowled.
there are 6 in 1 over then depending on the format of the game it will change the total amount in a match. In a test match the should be about 90 over per day so thats 540. In an ODI its 50 per innings so thats 300 and 600 per match. In a T20 there are 120 per innings and 240 per match.
In a standard tennis match, there are typically three tennis balls in play to begin the match.
Its 50 overs which means it is 50*6 balls that is 300+extras
20 per innings, so 40 in a full game