I understand You go to work. When you have a little time I'll answer you. I will not interfere with your working hours. When I send a message to you just read, it is no problem.
I understand you are busy with work. When you have time, you do not answer me. I will not interfere with your work. When I sent a message to you just read was not an issue.
I understand. You are busy with work. When you have time you can answer me. I will not disturb your working hours? When I send a message to you just read with no problem!