Why is your grocery delivery taking so long? Your driver has 2 other deliveries.

• Delivery apps like Instacart and Walmart Spark often 'batch' orders together.
• But gig workers say it cuts into their income since they get paid less for each order delivered.
• Customers can also get frustrated waiting for an order to show up.

Last summer, some gig workers who delivered grocery orders for Walmart noticed a change: Instead of just delivering one order, they had to deliver two or three at once.