Greasing drive shaft through zerk fitting

Hello, I have a question that I cannot get a concrete answer. In Short, how much grease do I put down in my drive shaft via zerk fitting? Do I keep greasing until I see grease coming out through the slip yoke seal or not? This is what I have done thus far. However, some say this is bad because I can blow a seal?
In conclusion, this is the only zerk fitting I have on the whole car just front side of the driveshaft (propeller shaft) and I just want to make it right. Any response would be greatly appreciated and love your YouTube channel.

Ron (Atlanta Ga.)