how to set the response time or due date based on the working days and hours

[rTrack Support]

Hi Fidel ,

currently i am using the be low configuration to set the actual response time date field .

i found some option to use the working day and hours option using the below 

function in version history release pages .

formatWorkDuration(number duration) : string

shortFormatWorkDuration(number duration) : string

is there any possibility to include this in the below expression .please help me to resolve this .

[%{20761} = null AND %{10003} = "Sev1-Show Stopper"]addTimeSkippingWeekends({00009},toNumber(projectProperty("severity1Response")) * {HOUR}+1, EST)
[%{20761} = null AND %{10003} = "Sev2-Critical"]addTimeSkippingWeekends({00009},toNumber(projectProperty("severity2Response")) * {HOUR}+1, EST)
[%{20761} = null AND %{10003} = "Sev3-Not Critical"]addTimeSkippingWeekends({00009},toNumber(projectProperty("severity3Response")) * {HOUR}+1, EST)
[%{20761} = null AND %{10003} = "Sev4-Trivial"]addTimeSkippingWeekends({00009},toNumber(projectProperty("severity4Response")) * {HOUR}+1, EST)