本科函授是一种通过函授教育方式获得学士学位的教育形式。对于想要报考一建的人来说，他们可能会考虑以本科函授多少年才能报一建。然而，具体的答案并不是简单的一个数字。让我们来看看这个问题。

首先，需要明确的是，一建指的是国家职业资格中的一级建造师考试。这是一个专门针对工程建设领域的考试，需要具备一定的理论知识和实践经验。因此，报考一建并不仅仅依赖于本科函授的学习时间。

其次，本科函授的学习时间可以根据个人的情况而定。一般来说，本科函授的学习时间范围在3到5年左右。具体的学习时间取决于学生自身的学习进度和学校的教学安排。有些学生可能会选择加快学习进度，更快地完成学业，而有些学生可能会因为工作或其他原因而延长学习时间。

此外，报考一建需要满足一定的条件。首先，需要具备相应的学历背景，一般是本科或以上学位。其次，需要具备一定的工作经验，通常要求在建筑工程领域从事相关工作不少于5年。最后，还需要参加一建考试的报名和资格审核。

所以，要回答本科函授多少年才能报一建的问题，我们可以说并没有固定的时间要求。学习时间取决于个人的学习进度和学校安排，而报考一建则需要考虑学历背景和工作经验等因素。

In English:

"How many years does it take to apply for the Level 1 Construction Engineer Exam (一建) with a distance learning undergraduate degree?"

Distance learning undergraduate programs offer an opportunity to earn a Bachelor's degree through a correspondence education system. For individuals considering applying for the Level 1 Construction Engineer Exam (一建), they may wonder how many years of distance learning undergraduate study are needed before being eligible to apply. However, the answer to this question is not a simple number. Let's explore this topic further.

Firstly, it is important to clarify that the Level 1 Construction Engineer Exam (一建) refers to a national vocational qualification in the field of construction engineering. This exam requires a certain level of theoretical knowledge and practical experience. Therefore, eligibility for the exam is not solely dependent on the number of years spent pursuing a distance learning undergraduate degree.

Secondly, the duration of a distance learning undergraduate program can vary based on individual circumstances. Generally, it takes around 3 to 5 years to complete such a program. The specific duration depends on the student's learning pace and the teaching schedule of the institution. Some students may choose to expedite their studies to complete the program more quickly, while others may prolong their studies due to work or other commitments.

Furthermore, eligibility for the Level 1 Construction Engineer Exam (一建) is contingent upon meeting certain requirements. Firstly, one needs to possess an appropriate educational background, typically a bachelor's degree or higher. Secondly, a certain amount of work experience is required, usually no less than 5 years in the field of construction engineering. Lastly, registration and qualification assessment for the exam are essential steps.

Therefore, to answer the question of how many years of distance learning undergraduate study are needed before applying for the Level 1 Construction Engineer Exam (一建), there is no fixed time requirement. The duration of study depends on individual progress and institutional arrangements, while eligibility for the exam is influenced by factors such as educational background and work experience.