If total disability strikes, your premiums aren't waived instantly; a waiting period runs first. See who pays each premium, when the insurer takes over, and how coverage keeps building the whole time.
A waiver of premium for total disability benefit means the insurer will pay your life-insurance premiums for you if you become totally disabled, but only after you have been disabled for the waiting period written into the policy (commonly 3 to 6 months). Until that clock runs out, the premiums that fall due are still yours to pay. Each step in the chart is a premium coming due: warm bars are ones you cover during the wait; blue bars are ones the insurer takes over once the waiver kicks in.
Two policy variations matter. Some contracts waive premiums retroactively to the start of the disability (refunding what you paid during the wait, so your net cost falls to zero); others only waive premiums that come due after the waiting period. Either way, while premiums are waived the policy keeps working for you: coverage stays in force and benefits keep accruing: dividends are still paid on a participating policy, cash value keeps growing, and every rider stays active.