It is better to do Du'a after each prayer as there are specific Du'a after Dhuhr prayer and after Assr prayer and after Maghrib prayer and after Isha prayer. You can also do Du'a after completing joined prayers if you wish.
Thank you for your question. They generally prayed the 5 prayers at their separate times.
At the same time, even when the prayers of zuhr and asr and magrib and isha are combined this is still prayers 5 times a day even if the gap between the prayers is small. So it is a mistake to say Shias pray 3 times a day. The prayers are 5.
May you always be successful
as salam alaikum
there is no situation in which not to combine prayers should be considered a worst option except when it brings unbearable hardship like during illness or travel (wherein combing prayers can be considered a better option).
In a letter to the governors of various places, Imam Ali, peace be on him, advised his subordinates to establish prayer in five different times of the day:
"Now say the zuhr (noon) prayers when the shade of the wall of the goats' pen is equal to the wall. Say the asr (afternoon) prayers with them when the sun is still shining in a portion of the day enough for covering the distance of two farsakhs (about six miles). Say the maghrib (sunset) prayers when he who is fasting ends the fast and the pilgrim rushes (from Arafat) to Mina. Say the `isha' (night) prayers with them when twilight disappears amd up to one third of the night. Say the (early) morning prayers when a man can recognize the face of his companion" (Nahj al-Balaghah, letter 52).
Therefore there is no problem to prefer to pray in five different times a day in normal circumstances at any time.
With prayers for your success.
The Quranic verses regarding timing of obligatory Prayers ( Al-Israa 78 and Hood 114) are very clear that there are three timings only; Fajr and Midday and Maghrib.
The Prophet Muhammad (SAWA) had prayed Zohr and Asr together, and Maghrib and Isha together according to authentic Hadeeths in Saheeh al-Bukhari (Mawaqeet al-Salaah , Hadeeth number 516, 529) and Saheeh Muslim, Hadeeth number 1146, 1147).
We follow the Prophet (SAWA) in each and every matter, and combine when we need to combine but separate the Prayers as well because both ways is allowed.
Many of our Ulama say that combining the Prayers is better while some Ulama say that separating the Prayers is better if you can.
Thank you for your question. According to the school of Ahl al-Bayt (as) there is no problem with combining the zuhr and asr prayers in that sequence (one prayer immediately after the other or with any time gap between) after the time of zuhr has set in without any specific reason. Similarly there is no problem with combining magrib and isha prayers after the time of magrib. So there is no problem praying isha prayer after magrib prayer and before 7pm.
May you always be successful.
The Prophet Muhammad (SAWA) himself used to pray Zohr and Asr together, and Maghrib and Isha together in Madina in usual situations as you can read in main Sunni books of Hadeeth like Bukhari and Muslim etc. He used to say when he was asked why: I do not want to put a burden on my Umrah :كي لا أشقّ على أمتي
This is a useful link