Week in, week out
Definition 1 of 1
Pro Tip 1/3Consistency
This phrase emphasizes the regularity of an event, stressing that it happens every week. 
He attended the French classes week in, week out, to improve his language skills.
Pro Tip 2/3Endurance
'Week in, week out' suggests a sense of unchanging continuation, often implying persistence or endurance. 
The team trained in the rain week in, week out, determined to win the championship.
Pro Tip 3/3Neutral Tone
The phrase is neutral and factual, free from positive or negative connotations unless context provides them. 
The cafeteria serves the same menu week in, week out.