For a complete push-button (including contacts), it is necessary to consider the B10/B10d of the contacts
For the contact, you should consider the electrical endurance according to the current and voltage used
B10 (e-Stop) = 300000 cycles
B10 (contact) = 1000000 at nominal current AC15 (230V, 2A)
B10 (complete PB) = min{B10(operator), B10(contact)} = 300 000
For E-Stop, B10d = B10/0.2
B10d (E-Stop) = 1500000

Released for: Schneider Electric India