Often equipped only with head lamps and homemade maps, they explore the tunnels and ancient rooms, sometimes staying underground for days at a time.
Then they waited hours and hours, sometimes days, for news of their loved ones.
Sometimes I long for the days when newspapers and magazines were the main sources of economic information for investors.
As it turned out, for the two weeks we were in Liberia it rained almost every day, sometimes nonstop for two or three days.
But sometimes I yearn for the days of former Fed chairmen Paul Volcker and Alan Greenspan, who revealed nothing of what the Fed was thinking.
Researchers travelled for 14 days, sometimes in freezing temperatures, to establish the location at an altitude of 5, 000m.
The bullet to bite is so large that we're more willing to dribble out the price of sending out repair crews, and to put up with the far more substantial costs borne by individuals and businesses that go without power for hours, days and sometimes weeks.
But it does recommend that member states get together to form and train coherent multinational brigade-size forces available for deployment within 30 days, or sometimes 90.
"I mean sometimes I don't see or hear from them for days, " Zager says.
But Public Bill Committees (they used, misleadingly, to be called Standing Committees) are now allowed to call in witnesses - and the evidence given across two intensive days this week was sometimes quite riveting - both for content and for drama.
It said the UKBA ends its support 28 days after a decision, despite it sometimes taking far longer for applications for standard benefits to be accepted.
While extended school days can sometimes seem long, our mission in the quest for social justice, my students, their parents, and fellow teachers empower me to continue the struggle for educational equality for all students.
Sometimes, thoughts like that will send me down research paths that can distract me for days or longer.
Of course, sometimes I get big, tight-timeline projects and just buckle down for a week of long days like any freelancer.
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Every few days, Vinh Cao would do sets of pull-ups, sometimes using the glove for three minutes between sets, to test its effects.
And for all the talk of candor, Ford reviews, edits and kills comments before posting them, sometimes days after they are submitted.
In a world where foundations sometimes can take a year to give away money, his family foundation responds to a request for money within ten days.
Newspaper exclusives of this sort are sometimes said to be less valuable these days because of the internet, which allows everyone to see the news for free.
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In the old New Labour days it was sometimes said that party bosses trusted their MPs so little they even wrote identical press releases for them.
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