How can I adjust DNS TTL for quicker propagation?

[firebirdkids]

Is there a way to set the DNS TTL to something other than 86400?  That's a terribly long time.  I'm waiting for an MX record to propagate and was surprised to see the TTL is so high.  I'd like to avoid long name record propagation in the future.

[aera-community]

I could not find to SET the TTL value as well. By default it assigned 24hours. 

[the_punisher]

I have the same issue here. I'm trying to edit the TTL for a lower time but shopify doesn't let me do it. I spoke with their chat support and they plainly mentioned that shopify doesn't have such an option to edit TTL of any DNS records. Let me know how you solved it.