Confluence 6 offers now the 'concurrent page editing':
=> How to know what is the maximum number of users that can edit a wiki page at the same time?
There isn't a defined maximum, at least not one that Atlassian have made public. Best practise is to edit as much as you want, but save regularly. The more people that are editing, and the longer they edit without saving, the longer it will take to save and merge the changes.
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