I’m not really sure why our opinion matters on what’s reasonable contact, unless you are just looking to support her/ your view.
From previous work life joint residency was seen as the ideal and this could take a variety of forms, including one partner having nearly all weekend’s, which always seemed a bit off to me. But where dispute occurs alongside the principles of what is best for the children, being reasonable is viewed well by Court’s and certainly could support pre-court mediation. For example, it may be reasonable to concede the extra week night, but say no to the floating night as the children need a stable routine family life. Hence, she shouldn’t have to work around his sporadic working pattern, and it’s not reasonable of him to ask.
Just my view, I’m no lawyer.