Who approves time off
Every request goes to the team lead named on the person's record. If that field is empty, the request goes to whoever owns the Teamloom account, which is why Setup asks for team leads early.
To add a second approver, open Time off, then Approval rules, then the team. Two approvers means either of them can approve, not both.
A request nobody has acted on for five working days appears under Waiting on you with a reminder beside it.