Hi,

Well, that is feasible. To achieve that however do not use the "Assign task" action, but simply send e-mail to all users ("Send email" action) and then put buttons on your form ("Save and submit" ones) bond to a single numerical (for example) column. Then either use "Wait for item change" action, to hold workflow until someone clicks the button, what will write a specific value to that column or wait specific time.

Anyway - pause workflow, after it unpauses check if all answers are registered. If yes - move on, if not - go back to waiting.

You can do that with a state machine or a loop, with a boolean variable that indicates whether it should stop looping or not.

Regards,

Tomasz