Jurisdiction(s):
United Kingdom

Key definition

Duration definition

What does Duration mean? In debt capital markets, investment and treasury practice, duration describes how long, on average, it takes to receive a bond’s cash flows and how sensitive the bond’s price is to interest rate (yield) changes. Macaulay duration is the weighted average time to all cash flows, discounted at the bond’s yield; a higher Macaulay duration means cash flows are further out and the price is more interest rate sensitive. Modified duration translates this into an estimate of the percentage price change for a 1% change in yield. For securities with embedded options, practitioners may use effective duration. Duration is...

Child Student permission: grant periods, work and study conditions, supplementary study, course changes and sponsor changes under the UK Immigration Rules

Published by a LexisNexis Immigration expert

Practice notes

This Practice Note sets out comprehensive details on the durations and conditions of leave linked to entry clearance and permission to stay for individuals under the Child Student route, covering applicable work and study restrictions applied within the Child Student and earlier Tier 4 (Child) categories. See also Practice Note: Child Student: eligibility, which details the points-based and non points-based eligibility criteria for entry clearance and permission to stay applications made under the Child Student route.

Grant of permission

The length of permission issued to a Child Student is determined by several key relevant factors set out in the table below...

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Sarah Rimmington

UK Council for International Student Affairs

Before qualifying as a solicitor with Osbornes Solicitors LLP, Sarah worked as a law librarian in the Royal Courts of Justice and at Eversheds LLP. She has been an Advice and Training Officer at UKCISA since 2003, and has delivered training on student immigration for ILPA.The UK Council for International Student Affairs is the UK’s national advisory body serving the interests of international students and those who work with them. It does so through research, print and web-based publications, a national training programme, dedicated advice lines for students and advisers, and liaison and advocacy with institutions, agencies and government....

Web page updated on 22/05/2026

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