I have never ordered anything from any DNM, but definitely going to this week, so I dont have any experience with this, but from lurking on /r/darknetmarkets and /r/darknetmarketsnoobs a whole lot, it seems to be that vendors are really good at going on vacations then letting know last minute, am I the only one who thinks this is kinda weird or sketchy? I find it weird to order something and even the vendor replying, then 3 days later the vendor says "oh yeah I'm going on vacation, so sorry mate you have to wait 3 more weeks"
''Vacation'' can also mean something else. Busy with school, trip for work, planning a wedding, cant get ahold of new stock etc. Being more specific about what you're going to do/why you cant be online a lot for a little while is just bad opsec :)