User:Vogand

registration date: $$r$$

days: $$d$$

total minutes: $$m_t$$

missing minutes: $$m_m$$

percentage of spent minutes:$$p_m$$

total messages: $$M_t$$

missing messages: $$M_m$$

percentage of submit messages: $$p_M$$

minutes per day: $$\frac{m_t}{d}$$

percentage of missing minutes:$$1-p_m$$

spent minutes:$$\frac{m_m p_m}{1-p_m}$$