The bowing, the prostration the sitting in between the two prostrations and the standing after the bowing of the Prophet ﷺ but not qiyam (standing in the prayer) and quʿud (sitting in the prayer) used to be approximately equal (in duration).  

كَانَ رُكُوعُ النَّبِيِّ ﷺ وَسُجُودُهُ وَبَيْنَ السَّجْدَتَيْنِ وَإِذَا رَفَعَ مِنَ الرُّكُوعِ مَا خَلاَ الْقِيَامَ وَالْقُعُودَ قَرِيبًا مِنَ السَّوَاءِ  

Anas said, "I will leave no stone unturned in making you offer the prayer as I have seen the Prophet ﷺ making us offer it." Anas used to do a thing which I have not seen you doing. He used to stand after the bowing for such a long time that one would think that he had forgotten (the prostrations) and he used to sit in-between the prostrations so long that one would think that he had forgotten the second prostration.  

أَنْ أُصَلِّيَ بِكُمْ كَمَا رَأَيْتُ النَّبِيَّ ﷺ يُصَلِّي بِنَا قَالَ ثَابِتٌ كَانَ أَنَسٌ يَصْنَعُ شَيْئًا لَمْ أَرَكُمْ تَصْنَعُونَهُ كَانَ إِذَا رَفَعَ رَأْسَهُ مِنَ الرُّكُوعِ قَامَ حَتَّى يَقُولَ الْقَائِلُ قَدْ نَسِيَ وَبَيْنَ السَّجْدَتَيْنِ حَتَّى يَقُولَ الْقَائِلُ قَدْ نَسِيَ