How To Use These Words 年/月/分/秒 with 以上/以内/前/後/前後
First, let me explain these symbols "✔", "×" and "△".
✔ means "correct".
× means "incorrect" or "hardly used".
△ means "it depends on the person/the phrase" or "I don't know if it's correct or not."
Don't get me wrong.
The meaning of △ in Japanese is slight different than the mention above.
If you take a math/Japanese test in Japan, you might see a triangle drawn the paper.
For example
In Math test, it (△) means that the process is good, but the answer is wrong.
In Japanese test: When the question says "Write the answer in Kanji", but you write it in hiragana, a teacher might draw a triangle on your answer.
In Japan, we usually use ○（circle）instead of ✔.
✔ means:
I've checked.
I've read the word/phrase/sentence in an important paper or have read them and agree.
However it could also mean: Your answer is incorrect.(people usually write ✔ on your answer and it's not exactly ✔ in this case.)
I sometimes see the same mistakes in this site, like this "２年間前" , you have to write "2年前".
I'll give you an example.
Please note: My opinion might be wrong. If someone tells me their opinion, I could change my opinion. lol
1.以上
（１－１）（✔）２時間以上
（１－２）（✔）２分間以上/（✔）２分以上
（１－３）（✔）２秒間以上/（✔）２秒以上
（１－４）（✔）２年間以上/（✔）２年以上
（１－５）（✔）２箇月間以上/（✔）２箇月以上
（１－６）（✔）２日間以上（✔）/（✔）2日以上
（１－７）（△）２，３時間以上
（１－８）（×）２，３分間以上/（△）２，３分以上
（１－９）（×）２，３秒間以上/（△）２，３秒以上
（１－１０)(×）２,３年間以上/（△）２，３年以上
（１－１１)(×)２,３箇月間以上/（△）２，３箇月以上
（１－１２)(×)２,３日間以上/（△）２，３日以上
2.以内
（２－１）（✔）２時間以内
（２－２）（✔）２分間以内/（✔）２分以内
（２－３）（✔）２秒間以内/（✔）２秒以内
（２－４）（✔）２年間以内/（✔）２年以内
（２－５）（✔）２箇月間以内/（✔）２箇月以内
（２－６）（✔）２日間以内/（✔）2日以内
（２－７）（△）２,３時間以内
（２－８）（×）２,３分間以内/（△）２，３分以内
（２－９）（×）２,３秒間以内/（△）２，３秒以内
（２－１０)(×）２,３年間以内/(△)２，３年以内
（２－１１)(×）２,３箇月間以内/（△）２，３箇月以内
（２－１２)(×）２，３日間以内/（△）２，３日以内
３．前
（３－１）（✔）２時間前
（３－２）（×）２分間前/（✔）２分前
（３－３）（×）２秒間前/（✔）２秒前
（３－４）（×）２年間前/（✔）２年前
（３－５）（×）２箇月間前/（✔）２箇月前
（３－６）（△）２日間前/（✔）2日前
（３－７）（✔）２,３時間前
（３－８）（×）２,３分間前/（✔）２，３分前
（３－９）（×）２,３秒間前/（✔）２，３秒前
（３－１０)(×）２,３年間前/（✔）２，３年前
（３－１１)(×)２,３箇月間前/（✔）２，３箇月前
（３－１２)(×)２，３日間前/（✔）２，３日前
４．後
（４－１）（✔）２時間後
（４－２）（×）２分間後/（✔）２分後
（４－３）（×）２秒間後/（✔）２秒後
（４－４）（×）２年間後/（✔）２年後
（４－５）（×）２箇月間後/（✔）２箇月後
（４－６）（△）２日間後/（✔）2日後
（４－７）（✔）２,３時間後
（４－８）（×）２,３分間後/（✔）２，３分後
（４－９）（×）２,３秒間後/（✔）２，３秒後
（４－１０)(×)２,３年間後/（✔）２，３年後
（４－１１)(×)２,３箇月間後/（✔）２，３箇月後
（４－１２)(×)２，３日間後/（✔）２，３日後
５．前後
（５－１）（✔）２時間前後
（５－２）（×）２分間前後/（✔）２分前後
（５－３）（×）２秒間前後/（✔）２秒前後
（５－４）（×）２年間前後/（✔）２年前後
（５－５）（×）２箇月間前後/（✔）２箇月前後
（５－６）（×）２日間前後/（✔）2日前後
（５－７）（✔）２,３時間前後
（５－８）（×）２,３分間前後/（△）２，３分前後
（５－９）（×）２,３秒間前後/（△）２，３秒前後
（５－１０)(×)２,３年間前後/（△）２，３年前後
（５－１１)(×)２,３箇月間前後/（△）２，３箇月前後
（５－１２)(×)２，３日間前後/（△）２，３日前後
