Mistakes in Qiraat

Reciting the “daal” in “wa lad-daaalleen” for less than 6 seconds

Q: I heard that when reading Surah Fatihah, you need to make the sound of the “dal” in “wa lad-daaalleen” longer, till 6 seconds. However, it is difficult for me to count how many seconds and often I finish it in 3 second or so. Is my prayer valid even if I do it deliberately because I can’t count seconds when reciting?

Repeating a verse of Surah Faatihah while performing salaah

Q: I heard in salah, errors to do with waqf dont matter. Does this apply to stopping in the middle of a word and then resuming?

I attempted reciting waladhaleen twice and every time between the ‘leen’ part, my voice stopped because of an obstruction in my throat. However, the third time I tried again and the same thing happened, after the pause, my voice came back a second later and finished reciting the remaining letters. Because I paused abruptly, is my salah fine?