How long should be provided for preschool children (3-5 year olds) to rest in early childhood services? Is there a recommended time for rest/restful experiences?

Red Nose does not have specific recommendations for sleep time &/or duration for Child Care Services.
Some information provided by ACECQA includes the following:

Children have different sleep, rest and relaxation needs. Children of the same age can have different sleep patterns, which nominated supervisors and educators need to consider within the service. As per Standard 2.1 (element 2.1.2) of the National Quality Standard, each child’s comfort must be provided for and there must be appropriate opportunities to meet each child’s sleep, rest and relaxation needs.

Ensure that children who do not wish to sleep are provided with alternative quiet activities and experiences, while those children who do wish to sleep are allowed to do so, without being disrupted. If a child requests a rest, or if they are showing clear signs of tiredness, regardless of the time of day, there should be a comfortable, safe area available for them to rest (if required).

It is important that opportunities for rest and relaxation, as well as sleep, are provided.

https://www.acecqa.gov.au/resources/supporting-materials/infosheet/safe-sleep-and-rest-practices