Constant hdk::prelude::SESSION_TIME_FUTURE_MAX_MILLIS

pub const SESSION_TIME_FUTURE_MAX_MILLIS: i64 = 5000 + SESSION_HEADER_TIME_OFFSET_MILLIS; // 6_000i64

Maximum time in the future the session start can be in the opinion of the participating agent. As the header will be SESSION_HEADER_TIME_OFFSET_MILLIS after the session start we include that here.