Here in Canada an imam durng Taraaweeh in the last raka‟t on completing the Qur‟aan made a 15 minute Dua.

Answer

The imam who had recited a 15 minute dua right inside the Taraaweeh Salaat is a jaahil. The two raka'ts had to be repeated because he intentionally introduced a dua after the Qiraa't. This is indeed bid'ah.