Generator Question

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Is it normal for a Delco 6-Volt generator to take 15 seconds or so to come up to 6 Volts?

Background:  I rebuilt my Delco Remy 955H 6-volt positive ground generator.  I had the armature rewound and I replaced the field coils & brushes.  Cleaned everything up and repainted the case & put on a new ID tag.  Originally it was a 3-brush system with only one wire coming out from the armature brush and on the other side it had a resistor in parallel with a thermostat coming off the field coil going to internal ground.  I kept the three brushes, but added a wire from the field coil to exit through the case.  I replaced the resistor, thermostat and external relay with a saddle mount voltage regulator from Brillman.

I chucked up the shaft in my drill press set to 770 RPM.  I polarized the generator, temporarily shorting the Gen & Bat terminals on the regulator, following a service manual from Delco Remy.  I had a 6-Volt lamp connected to the Gen terminal on the regulator.  After temporarily shorting the two terminals with shaft turning, the lamp lit up and I measured 6.3 to 6.5 Volts with a multimeter.  But whenever I turn off the drill press and restart it a few minutes later, I find it takes about 15 seconds for the voltage to slowly build up.  Seems like a long time,  but the good news is it seems to hold pretty level at 6.3 to 6.5 Volts.