Abu Hurayrah (R) reported that the Messenger of Allah (SAWS) said: ‘Whoever says at morning and evening time:
سُبْحَانَ اللهِ وبِحَمْدِهِ (حين يصبح وحين يمسي)
Subhanal-lahi wabihamdih.(at morning & evening time)
‘How perfect Allah is and I praise Him.’
…one hundred times, none shall come on the Day of Resurrection with anything better except someone who has said the same or even more.’
morning: after prayer until the sunrises, evening: after AAasr prayer until the sunsets, however some scholars say: after the sunsets and onwards.