Never

One day Jesus told his disciples a story to show that they should always pray and never give up.
Luke 18:1 NLT

So let’s not get tired of doing what is good. At just the right time we will reap a harvest of blessing if we don’t give up.
Galatians 6:9 NLT

Never stop praying.
1st Thessalonians 5:17 NLT

But without faith it is impossible to please Him, for he who comes to God must believe that He is, and that He is a rewarder of those who diligently seek Him.
Hebrews 11:6 NKJV

We're told to pray. To pray without ceasing. And Jesus said to never give up. Paul writing to the  Philippians in 4:6, Don’t worry about anything; instead, pray about everything. Tell God what you need, and thank him for all he has done.

Don't give up if it doesn't happen immediately. Don't lose faith. It may take a little while longer for those seeds of faith to germinate, to grow and be watered, and to generate a harvest. 

Keep trusting. Keep praying. Keep believing! If an unjust judge can grant a petition (Luke 8:1-8), you know our God can and will. When do you stop? Never!

Prayer:

Father,

           Thank You for all You have done. Thank You for all you are doing, and all You are going to do. We shall never cease to praise Your Name and to seek Your face. By Your grace, in Jesus' Name we pray. Amen