Thread regarding ADP (ADP)

I bought some ADP shares at the beginning of the year and so far it worked out very well for me, despite all the advice from people that it was overpriced at that time. It is obvious that the stock has a healthy up worth movement with minimum volatility, so I’m holding for the time being.
Naturally, my only question at this point is at what value could we say that ADP has reached its peak? Are we close to that number in your opinion? For how long is it wise to hold?