How to say “That's relevant, but actual visitor numbers would give us a stronger reason to keep the evening hours.” in Japanese
In Japanese
それも夜の開館には関係があるけど、実際の利用者数が分かれば、続ける理由としてはもっと強いよね。
Sore mo yoru no kaikan ni wa kankei ga aru kedo, jissai no riyōshasū ga wakareba, tsuzukeru riyū to shite wa motto tsuyoi yo ne.