Tens of thousands of people were born from the old Kano collection, you have to read or? Eh, don't remember? Actually, Oh my. Great translation or difficult, and what I'm saying to be honest don't. But 10,000 is now starting with Kano collection of Waka in love with the original...
“Tens of minutes” can technically mean 20, 30, 40… minutes, BUT this is never used unlike hundreds and thousands. It is much more common to use that in something like “tens of thousands”. Depending on how much time you’re trying to communicate, you may consider just using “half...