Hey Don't feel guilty. This dilemma is faced by most of the working mothers. Do u have a joint family? If your in-laws take care of ur kid in your absence, then trust them, They are always better option than leaving ur child with maid. Though Quality time is not a substitute for quantity time, we working mothers have to compromise.
Play with him, whenever u have time. Also, if possible hire a full time maid so that instead of spending time in kitchen or other knick knack activities, u can give him more time.
Don't forget to Kiss him and hug him whenever u are with him or when u r leaving for office, coming back from office. It helps in bonding.