Calculating Daily Realized Variance with Non-Constant Sampling

I was able to obtain some tick data on a particular asset and I wanted to calculate the daily realized variance of the asset. After browsing through a few threads here, it seems the formula to calculate daily realized variance is simply (assuming you have constant time intervals): Where R^2 is the squared log returns from the constant time interval t , with a total of m time intervals during the day. If I had minute to minute tick data, I would ideally sample every minute and the calculation wou