Nah, 24 hours is way too short to start nuking threads, I reckon 6 weeks is fine as we don't know whats happening behind the scenes with PMs etc.
If the OP doesn't reply openly with still available/bump or sorry gone within 6 weeks , nuke away but people have lives and aren't or don't want want to be online all the time.
Edit: and as soon as I exit this thread I look at a For Sale thread for a 29 Cushcore that someone has revived from 2nd Sept that hasn't been touched by the Op since it's inception, arrggghhhh...Nuke away.