Great-West Financial allows customers to adjust their investment allocations as per the terms and conditions of their specific annuity or retirement plan. Generally, individuals may have the opportunity to make changes on a regular basis, such as monthly or quarterly, but this may vary depending on the product and the specific provisions outlined in the contract. Additionally, there may be limits on the number of changes allowed within a certain time frame. It is important for individuals to review their particular plan documents to understand the options available to them and any potential restrictions. For further details, a customer might find valuable information on the current web page regarding investment allocation policies.