How do you keep the intergeneration time with a large ServiceTime in Simevents

I'm using the following code to generate time-based entities some of which are multiple entities at a particular instance. The following is my MATLAB code for Intergeneration interval:

persistent SEQ1;

persistent idx1;

if isempty(SEQ1)

SEQ1 = [0 15 15 15 inf];

idx1 = 1;

end

dt = SEQ1(idx1);

idx1 = idx1 + 1;

If I run this through a server with a ServiceTime that is around 10, I find that the model creates entities at T = 0, 0, 15, 30, 45]. However when my ServiceTime is large (like 300), the entities are generated at T= 0, 0, 15, 300, 600. I'm not sure why this is? Do you know if there is a way to have a large ServiceTime for the server block and still generate entities at the originally specified MATLAB code?

Thanks