If this was a math's problem set as "homework", the answer would be 20 hours. *Since this is a riddle, the answer is "No time at all, as the wall has already been built by the previous 10 men."
 
the wall is already built, so nil hours, however if the wall wasn’t built it would take 20 hours for 5 workers to build the wall
 
Hello, Riddle Masters! This is a tricky one, isn't it? But still, a lot of you got it correct! 👏

Congratulations to these brilliant members! 🥳

Bawdyandy, Mark K, Stokr, Lancew, Big Al, Phil_Byrne, JollyDragon, Lawrence1945, Richard12, Narelle, Jan Palmer, MargieMac58, Suziq12, firefox, JIJ, Gerlinde Turchin, Denotany, pbattershill, Rosie2023!, Swizzle, Mrtnst, Catherine, AllenP, chean1210, Margaret 9, Harvey35, JenH23, Victor Jackson, Buzzy, Dazzasboats, Dizzy, burlighs007, Helen171, TrixieLovesTigers, NDA, Joymg, Suemalloo, Annie Webster, Mazda52, TrishH, Glennbee, DawnBonn, GrannyJen, Paul1951, KellyHollander, DuckyD, Jeanemily, John R, PeakA, CANDALYN49, Lowey, Topher, DasherD, LeahI, Senior72, Greg82, Linda51, dancequeen1, leslie_may, Vickers, Deborah Crompton, KenBruce, Pynro, Marybell, Gai Russell, chezna, NeilPerry, JulesPalm, rodgersplace, goatwhisperer, Bearmaker, maxtyson, NickyW, olliebell61, Tilbacroc, Freeman27, Jennymg, Laurie53, 168623, thomas, Rosa07, Sheriella, WADuck, MCF, LoveAGoodDeal&7, KennyB, dittos, Gil, Vass54, Suepermunn, Maiyon, Luckyus, Vidbri1953, Lynnyrose, Abinme, Tuppence37, MarieT, Aggie, LesVG, SandyM, midgemills, RealityCheck, rathompson, Margew

A friendly reminder too that we use the 'Wow' react only as a means to filter the answers and should not be taken as sarcastic feedback 🙏

See you in the next riddle! 😉
 

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