ConsistentInterval.cs

public class ConsistentInterval : IDisposable
{
    private readonly TimeSpan delay;
    private readonly CancellationToken cancellationToken;
    private readonly DateTimeOffset startTime;
    
    public ConsistentInterval(TimeSpan delay, CancellationToken cancellationToken)
    {
        this.delay = delay;
        this.cancellationToken = cancellationToken;
        this.startTime = DateTimeOffset.UtcNow;
    }

    public void Dispose()
    {
        var delayTime = this.startTime.Add(this.delay).Subtract(DateTimeOffset.UtcNow);
        Task.Delay(delayTime, this.cancellationToken).GetAwaiter().GetResult();
    }
}