Generally you will not know exactly when the Bless My Space service is taking place.
The blessing is scheduled with the Bless My Life Energy Team to occur when your space is at its most quiet. This will usually be when no one is using the space.
This is intentional so that the highest potential blessing can take place for you and the space.
If you are very sensitive to energy and have a clear connection with the Angels, your Higher Self or spirit guides then you may have an awareness of the subtle increase of vibrational energy taking place with each blessing.
If you are not so sensitive to energy then you may not feel it taking place immediately. The impact of the increase in vibrational energy may be noticed in subtle ways over time.