How to write the correct expression for a custom wait step

The current journey design adopts wait steps after each segment ranging from 30 mins to 4.5 hrs. This unnecessarily uses a wait nodes. I want to simplify the journey/reduce the number of nodes.

 

Therefore, I instead want to replace these wait nodes with a single custom wait step. I have written an expression. The AJO expression editor has validated the syntax (yay!), so it seems I might be on the right track. However, can anyone confirm that this expression is correct? Do I need to include other functions? Or is there a simpler expression I can write?

Note: I am using the event schema to trigger profiles to enter the journey, and each profile that enters is segmented as defined by the triggerDelay attribute defined in the schema construct. I am using this segment to define the number of minutes to wait ranging from 30 minutes to 270 minutes (4.5 hrs).

if (@event{DW1267_J1_WBC_Dec_AdvocacyDW1267_J1_WBC_Dec_Advocacy._wbg.customerEventAttributes.nonPiiAttributes.triggerDelay} == "1") then
  (toDateTimeOnly(nowWithDelta(30,"minutes")))
else
  (if (@event{DW1267_J1_WBC_Dec_AdvocacyDW1267_J1_WBC_Dec_Advocacy._wbg.customerEventAttributes.nonPiiAttributes.triggerDelay} == "2") then
    (toDateTimeOnly(nowWithDelta(90,"minutes")))
else
  (if (@event{DW1267_J1_WBC_Dec_AdvocacyDW1267_J1_WBC_Dec_Advocacy._wbg.customerEventAttributes.nonPiiAttributes.triggerDelay} == "3") then
      (toDateTimeOnly(nowWithDelta(150,"minutes")))
else
  (if (@event{DW1267_J1_WBC_Dec_AdvocacyDW1267_J1_WBC_Dec_Advocacy._wbg.customerEventAttributes.nonPiiAttributes.triggerDelay} == "4") then
      (toDateTimeOnly(nowWithDelta(210,"minutes")))
else
  (toDateTimeOnly(nowWithDelta(270,"minutes"))))))

Validated Syntax