By when AIS gets completely updated

Dear Sir/Madam,

I remember earlier Form 26AS would take about 2 - 3 months to completely reflect your TDS and such details, like after FY end one needed to wait till June end to see final Form 26AS.

What I wish to know is by when is AIS completely updated or reflects all applicable entries for the FY?

When is the right time to refer to AIS to start ITR data compilation.

Thanks