What's the best way to handle our normal schedule of:

1) Pick us up from the hotel early in the morning (7A), drop us at the Gurgaon office
2) Pick us up late afternoon (4-5P), drop us at the hotel
3) Sometimes pick us up a few hours later, take us to various places for dinner, etc

Should I just get a driver for the full day, or is it possible to release them to other things while we're at the office and just set a "show back up" time?

I've seen it happen both ways, and in the past have just called for a new car when we get ready to leave (and keep that car until we're done for the night). I notice that others just have the driver wait around all day until they are ready to go.