Review on a schedule, not on a mood. Once a year is enough for most people; once every six months if you prefer. Daily checking does not improve returns and reliably worsens decisions.
At a review, ask four things. Has my goal or horizon changed? Has any fund changed manager, mandate or category? Has the mix drifted far from the target because one sleeve grew faster? Is there a fund that has trailed its benchmark for three straight years, not one?
Then do the least that fixes what you found. Most reviews should end with no action. The point is to confirm the plan still fits, not to find something to change.
Review once a year. Most reviews should end with you changing nothing.