How to set delay or interval inside map Promise?

Question

I have Promise.allSettled code and inside the iterable, I call an API. It will increase API calls significantly if I have much data. So I want to reduce the API calls. I think I can achieve it if I call the API every 5/10 seconds. How to set the delay from each iterable item inside the .map?

//API
async function searchMerchant(merchantName) {
  try {
    const indexs = await index.search(merchantName, {
      attributesToRetrieve: ["merchant_id", "name"],
      restrictSearchableAttributes: ["name"],
      typoTolerance: false,
      hitsPerPage: 1,
    });
    return indexs.hits;
  } catch (error) {
    console.error(error);
    return error
  } 
}

Promise.allSettled(
  merchants.map(async (merchant) => {
     //how to set delay inside this block
     const merchantDetails = await searchMerchant(merchant.name);
     return merchantDetails;
  }
).then(res => console.log(res))