Mark 1:30-31:

But Simon’s wife’s mother lay sick of a fever, and anon [immediately] they tell him of her.
And he came and took her by the hand, and lifted her up; and immediately the fever left her, and she ministered unto them.

Notes on Mark 1:30-31:

Jesus rebuked the fever in the same stern way that He rebuked demons.  This only appears in Luke’s account (Luke 4:38-39).  The same Greek word translated rebuke when Jesus rebuked demons was the same word that describes what Jesus did to the fever.  This shows that Jesus hates sickness just as much He hates demons!

Luke called it a great fever.

This shows that there does not have to be a “recovery time” from an illness.  Peter’s mother-in-law was healed immediately and resumed her normal life.  However, there may be cases where the sick “recover’ (which is promised in Mark 16:17-18) but do not “recover immediately” (which is not promised).

See also:

Matthew 8:14-15
Notes on Matthew 8:14-15
Luke 4:38-39
Must We Lay Hands on the Specific Afflicted Body Part?

Condition: Fever