"It is 10:10."
Writing every single character in hiragana is probably easier since many kanji are rather complex. Take for instance the sentence 電車に乗ります「でんしゃにのります」
That said, reading becomes a whole lot easier once you have learned it. Learning it takes quite a bit of effort though.
edit: Or take the word for 'airplane': 飛行機「ひこうき」
十分 can be pronounced じゅっぷん or じゅうぶん depending on context. Duo's automated TTS is not good at guessing context though.
分 pronounced as "fun/pun" is a counter for minutes, pronounced as "bun" it is a counter for parts
juppun would be 10 minutes, juubun means "enough/complete/whole" (because 10/10 is whole)
You'll also see bun in 半分 hanbun "half" (a portion)