Unless it drops to zero for 6 hours. There is actually useful and actionable information to be gleaned in such events.
To "noob proof" it maybe just 1 day hashrate and provide the time since last block. I am too lazy to do the math but given that Bitcoin is a poisson distribution one can provide a 95% confidence interval as a sanity check "WARNING time since last block exceeds 95% confidence interval for 50 TH/s".