Some appear and then, some days later they put countdown time or the faucet is full of ads, pop ups and anti-bot links making the "without time between claims" feature be worthless... Better to choose a faucet list and make a run normally, don't bothering with countdown time of faucets.
Yes, have to be alert. For those wanting to make $2-$3 a day using faucets here's my advice:
1.Get on faucethub, owners sometimes post giveaways/large payouts in the chatbox
2.find all the highest faucets even if they are once a day, once an hour etc.. then plot them out on a spreadsheet or text file or program a list (the faucet rotators and lists aren't that great for grinding imo), then put smaller ones in between, you should find that if you will grind faucets for 10 hours a day you should be able to fill almost every 5 minutes.
3.Use smart phone apps, these are often highest paying, usually much simpler and you can do whilst using desktop/laptop faucets.
4.Keep a list of scammy ones or good ones so you can remember.
One posted on faucethub is pretty good, honestly I just update my own list, faucets come and go so quickly, and change payouts it's hard to use them so reliably. I don't wanna post it here as too much attention will make it hard to earn from but pm me I will link you a faucet game that is probably highest paying.