Cooking bacon in the oven is a great way to achieve a perfect crisp without the mess of stovetop frying. Here's an explanation of how long to cook bacon in oven for the perfect crisp:

1. Preheat the oven: Start by preheating your oven to 400°F (200°C). Preheating ensures that the bacon cooks evenly and gets crispy.
2. Prepare a baking sheet: Line a baking sheet with aluminum foil or parchment paper to catch any grease and make cleanup easier. You can also place a wire rack on top of the baking sheet to elevate the bacon and allow the fat to drip away, resulting in an even crispier texture.
3. Arrange the bacon: Lay the bacon strips in a single layer on the prepared baking sheet. Make sure the slices don't overlap to ensure even cooking. If you're using a wire rack, place the bacon on top of it.
4. Place in the oven: Put the baking sheet with the bacon into the preheated oven. Position it on the middle rack for even heat distribution.
5. Cook time: The cooking time will vary depending on the thickness of the bacon slices and your desired level of crispness. On average, thin bacon slices usually take about 12-15 minutes, while thicker slices may need 15-20 minutes. Keep an eye on the bacon as it cooks to prevent it from burning.
6. Flip halfway (optional): If you prefer your bacon evenly crispy on both sides, you can flip the bacon strips halfway through the cooking process. This step is optional but can result in more uniform crispness.
7. Check for desired crispness: As the bacon cooks, keep an eye on its color and texture. When the bacon reaches your preferred level of crispness, remove it from the oven. Remember that the bacon will continue to crisp slightly as it cools, so take it out just before it reaches your desired level.
8. Drain and serve: Once you remove the bacon from the oven, transfer it to a paper towel-lined plate or a wire rack to drain excess grease. Blot the bacon with paper towels to remove any remaining grease.
9. Enjoy: Now your perfectly crisp bacon is ready to be enjoyed! Serve it alongside your favorite breakfast dishes, in sandwiches, or as a topping for salads and other recipes.

Remember to use oven mitts or heat-resistant gloves when handling the hot baking sheet and be cautious of hot grease. Also, cooking times can vary, so it's essential to monitor the bacon closely to achieve your preferred level of crispness.

By following these detailed steps, you'll be able to cook bacon in the oven to perfection, resulting in deliciously crispy slices every time.