A woman working on her side hustle, filming herself preparing food in her kitchen and creating online content for her cooking channel.gettyClose to half of Americans have a side hustle, according to a survey from QuickBooks. It’s easy to see why; side hustles are a popular way to improve financial security during times of economic uncertainty. Side Hustle Nation reports that 80% of side hustlers do so to increase their income, and a survey from The Penny Horder found that 53% of people would struggle to cover their expenses without a side hustle.Forbes5 Ways Small Businesses Can Profit From America's Staycation SummerBy Chelsea TobinMany workers find it difficult to build a sustainable side hustle alongside a full-time job. There are only so many hours in the day, and managing both a corporate career and a side hustle can become a recipe for burnout. Here are three ways you can sustainably build a side hustle alongside full-time work.1. Set Strong Client BoundariesOne of the most important strategies for sustainably running a side hustle is setting boundaries around your time and client or customer expectations. For example, if you do freelance work, then you’ll need to set boundaries around the times you’re available to speak to your clients. They should know you are unavailable during your full-time job hours, and ideally your freelance contract should explain these boundaries in writing.MORE FOR YOUIt might sound pedantic, but boundaries help set everyone up to win. Clients should know exactly what to expect from you, and you have the freedom to deliver your best work on your terms, at a time that works best for you.Forbes5 Freelance Writing Side Hustles For People Who Love To WriteBy Chelsea Tobin2. Know Your Time Limits And PrioritiesEven if you thrive on the hustle of managing a side hustle and a job, you should know your limits. Decide how many hours per week you’ll dedicate to your side hustle, when you'll work on it, and when you'll switch off. According to Ominisend, five to nine hours is the most common amount of time spent on a side hustle each week. Also weigh up how much time you need for family, friends, gym, or other life commitments. This helps prevent the side hustle from becoming a second full-time job, and keeps you from neglecting your other priorities.3. Choose A Side Hustle That Works For YouThere’s a huge variety of side hustles to choose from, but that doesn’t mean they will all suit you. The key to building one alongside a corporate career is being very selective about your side hustle choice. For example, if you decide you only have five hours per week to dedicate to a side gig, then running an e-commerce business where you have to manually package and ship out products may not be the right fit for you.Here are a few things to keep in mind:Choose a side hustle that you can market efficiently in only a few hours per week. Marketing is essential for attracting customers, but if your side hustle requires hours of marketing each week, then it may not be sustainable to run alongside a full-time job.Choose one that actually interests you. The more passionate you are about it, the easier it will be to spend time building a side hustle.Check your employment contract and ensure your side hustle is not a conflict of interest with your full-time role.A side hustle is a strategic way to earn extra income. But not all side hustles are created equal, and you must be discerning about the type of side hustle you choose and how you manage it alongside your corporate job. It should support your financial security, not come at the expense of your time, well-being, and existing career.