Question

Assalamualikum
This is quite hard to explain, I hope you understand.
I have been studying tajweed for a long time but just recently we have been
told that the right way to pray is e.g. Jeeeeeeeeeem instead of jeeem how we used to pray. What I’m trying to say is that letter like jeem, sawd, seen, Qaf, kaf, etc., we have to lengthen for at least 5 seconds +. This is all new to me and it doesn’t seem as everywhere else is praying that way. Could you send me a link or explanation where I can hear a qari pray the makhraj? I would prefer someone like Sheikh Abdul Rahman Sudais or  Sheikh Saud Shuraim, as they are Sheikhs who people will actually recognize.
Jazakallah.
May Allah reward you for your efforts.

Answer

Wa alaikum assalaam wa rahamatu Allahi wa barakatuh.

It seems that you are referring to lengthening at the end of a word where there is a medd letter followed by one voweled letter, and we are stopping on this word.  In this case the last letter acquires a temporary or incidental sukoon, and we lengthen the medd letter 2, 4, or 6 vowel counts.  This is called .  The timing though is not measured in seconds, but in vowel counts.  The timing for each individual vowel count should be equal to the other individual vowel counts, and lengthenings then based on this are equal to two, four, or six vowel counts.  

An example would be in the second and third aayaat of surah Al-Faatihah:  

The following three different sound links demonstrate the three different allowed lengthenings of this medd.  The reciters are all known reciters, but not the shuyookh requested. Please note the slow reading for the every vowel in the four vowel count lengthening.  One may think that it is six vowel counts, but when you hear his whole recitation and feel the vowel counts, it is actually four vowel counts that he lengthens the medd.

Two vowel count lengthening

Four vowel count lengthening 

Six vowel count lengthening

Wa iyyaakum.  Wa assalaam alaikum wa rahmatu Allah.