I get that there are differing opinions on what “next thursday” means when said on a wednesday, but when you say it on a thursday, it definitely means “in seven days” and not “this thursday”.
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Based on my experience it’s kind of unspoken standard that “next weekday” always refers to closest weekday occurrence where delta between now and that weekday is at least 6 days.
For me, I think it’s equivalent to “weekday in the next week”, so for me it could be <6 days, but then you also get into issues with Sunday 
Seems very culturally dependent: https://english.stackexchange.com/questions/3841/which-day-does-next-tuesday-refer-to
In any case, it’s definitely>0 days
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