JP - How many grails at the moment?

Since I'm using (*cough*wasting*cough*) all my grails right now, I was wondering how many grails it is possible to have in JP right now. (Considering none have been used and all the grails from events).
I don't really know how it works after the Singularitys since I really don't want to spoil myself too much. I only read a few things about Lostbelt and Sub-Singularitys or something like that.

Thanks in advance!