Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
suyuti:16017a –
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السيوطي:١٦٠١٧a –

"في الْجَنَّةِ مائَةُ دَرَجَةٍ، مَا بَينَ كُلِّ دَرَجَتَينِ مائَةُ عَامٍ".  

[ت] الترمذي حسن غريب عن أبي هريرة

See similar narrations below:

Collected by Tirmidhī, Aḥmad, Suyūṭī
tirmidhi:2529 – ʿAbbās al-ʿAnbarī > Yazīd b. Hārūn > Sharīk > Muḥammad b. Juḥādah > ʿAṭāʾ > Abū Hurayrah

"In Paradise, there are a hundred levels, between every two levels is (the distance of) a hundred years."  

Abū ʿĪsá said that this Ḥadīth is Ḥasan-Ṣaḥīḥ.
الترمذي:٢٥٢٩ – حَدَّثَنَا عَبَّاسٌ الْعَنْبَرِيُّ حَدَّثَنَا يَزِيدُ بْنُ هَارُونَ أَخْبَرَنَا شَرِيكٌ عَنْ مُحَمَّدِ بْنِ جُحَادَةَ عَنْ عَطَاءٍ عَنْ أَبِي هُرَيْرَةَ قَالَ

قَالَ رَسُولُ اللَّهِ ﷺ فِي الْجَنَّةِ مِائَةُ دَرَجَةٍ مَا بَيْنَ كُلِّ دَرَجَتَيْنِ مِائَةُ عَامٍ  

قَالَ أَبُو عِيسَى هَذَا حَدِيثٌ حَسَنٌ صَحِيحٌ
ahmad:7923 – Yazīd > Sharīk b. ʿAbdullāh > Muḥammad b. Juḥādah > ʿAṭāʾ > Abū Hurayrah

"In Paradise, there are a hundred levels, between every two levels is (the distance of) a hundred years." (Using translation from Tirmidhī 2529)   

أحمد:٧٩٢٣ – حَدَّثَنَا يَزِيدُ أَخْبَرَنَا شَرِيكُ بْنُ عَبْدِ اللهِ عَنْ مُحَمَّدِ بْنِ جُحَادَةَ عَنْ عَطَاءٍ عَنْ أَبِي هُرَيْرَةَ

عَنِ النَّبِيِّ ﷺ قَالَ الْجَنَّةُ مِائَةُ دَرَجَةٍ مَا بَيْنَ كُلِّ دَرَجَتَيْنِ مِائَةُ عَامٍ