The fuse blowing time is calculated based on the type of fuse you are using. By default, the fuse type is ATO. (Quickstart/ComponentModels/CircuitProtectors/Fuse)
The fuse blowing or not is based on the follwing calculation:
percentBlow %= blowCurrent * 100.0 / fuseRating;
If a fuse does not blow, then the blow time is zero.
Please note the fuse model with VeSys 2.0 / Capital v2011.1 were changed, if you have an earlier version of VeSys 2.0 / Capital then the blow time was not reported.
The new models are located in /quickstart, however more than likely your existing design is still referencing the fuse model in /CHS. You can change that by accessing the model attacher (RMB --> Analysis --> Attach) and picking the newer model. (/Quickstart/ComponentModels/CircuitProtectors/Fuse)
I hope this helps