Which timings are there during which no prayer can be offered?

                 Which timings are there during which no                                                    prayer can be offered?

                                             Answer: 

The timings during which no prayer is lawful are three i.e. sun-rise, sun-set and meridian.

The duration of the sun-rise and sun-set is of (about) 20 minutes and the meridian is of 35-40 minutes. During these timings no obligatory, essential, optional and missed (Qaza) prayer and no prostration (Sajda-e-Tilaawat and Sajda-e-Sahv) is permitted.