The best way to not burnout is to help (mandatory) in a selective way. Better than telling any colleague a big yes, try to help in a way your routines are not affected. Offer them your own solutions, your advice, help them to manage their time for the following time... You don't need to be late (always) because of negligence and continued disorganization of your colleague. You don't have to leave (never) your own tasks unattended. Be kind and help them when any unpredicted workload appears. Never forget that probably it will also occurs to you at any point.

Communicate clearly: While helping everyone to complete everything is no, not helping is a big no. Enabling is a big yes, if we can provide them resources more of references and ideas and ask them to get back it's a win win for both

To set boundaries with colleagues seeking last-minute help, clearly communicate your current priorities and availability, like saying, “I’m focused on a high-priority task but can offer limited help.” This signals your willingness to assist without compromising your workload. You can also establish preferred availability by mentioning, “I’m generally more accessible for quick help until [time].” Guide them to resources or documentation where they can find answers, encouraging independence. Regular check-ins for common questions can address their needs without affecting core responsibilities, balancing collaboration with your time management.

Set clear yet friendly boundaries by communicating openly. Let them know you're happy to help once you've completed your own tasks. Offer alternatives, like directing them to resources or suggesting they check in with others who may be free. Be honest about your current workload and set realistic limits on the time you can spare. A balanced approach helps you stay supportive without compromising your own responsibilities, showing respect for both your priorities and theirs.