Refereeing the table and given the duration required for the first two activities, "Create the technical plan" and "Estimate resources," what is the duration to complete these two activities?

WBS

Activity

Predecessors

Resource Name

Duration

TRN$001\mathrm{.}1$

Technical Planning

TRN$001\mathrm{.}1\mathrm{.}1$

Create technical plan

Technical Experts, Software Development

Leads

$10$ Days

TRN$001\mathrm{.}1\mathrm{.}2$

Estimate resources

TRN$001\mathrm{.}1\mathrm{.}1$ FS

Project Manager, Technical Experts, Functional Managers

$4$ Days

TRN$001\mathrm{.}1\mathrm{.}3$

Plan reviews

TRN$001\mathrm{.}1\mathrm{.}2$ FS

Project Manager, Technical Experts, Users

$5$ Days

TRN$001\mathrm{.}1\mathrm{.}4$

Plan authorization

TRN$001\mathrm{.}1\mathrm{.}3$ FS

Users, Project Manager

$2$ Days

a$.$

$6$ days

b$.$

$12$ days

c$.$

$8$ days

d$.$

$14$ days

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