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The timeline to install countertops largely depends on the materials and the job size. Installing granite countertops takes anywhere from two to seven hours, though complex designs can pass the eight hour mark. Average-sized quartz countertops take two to five hours to install, though most pros will recommend a 24-hour settling period. Marble, on the other hand, is finicky and can take up to two whole days to install. No matter how you slice it, however, a professional is going to complete the job much quicker than an amateur.

The frequency for sealing granite countertops depends on several factors, including the type of sealant used, the color of the granite, and how heavily the countertops are used. As a general guideline, resealing is often recommended every 12 to 18 months, but some sources suggest it could be as often as every few months or at least once a year.

The type of sealant is a major factor: water-based sealants may need reapplication every six months to a year, while more durable solvent-based sealants can last for five to 10 years. Additionally, factors like heavy kitchen traffic, frequent use of acidic cleaners, and lighter granite colors may require more frequent sealing to prevent staining.

To determine if your countertops need resealing, you can perform a simple water test. Place a few drops of water or a wet paper towel on an inconspicuous area of the granite. After 10 to 15 minutes, check the spot. If the water has beaded up, the seal is still intact. If the water has been absorbed and darkened the stone, it's time to apply a new coat of sealant. You can choose to seal the granite yourself or hire a professional to ensure it's done correctly.

Onyx countertops have pros and cons. If you seal it properly and take care not to damage it, it can make a good countertop surface. However, it's more often used in bathrooms, where it’s less likely to sustain damage. Having an onyx kitchen countertop is possible, but you’ll need to take extra care not to burn, stain, or otherwise damage the material.

If you have light renovation experience, you should be able to build your own countertop made from wood or laminate. These tend to be the most DIY-friendly materials, but you’ll need to be comfortable using a circular saw and taking precise measurements. When it comes to installation, leave anything that involves plumbing, electricity, or gas lines to the pros.