(1) If a partnership contract provides for no fixed period of the duration of the partnership, or if it has been specified therein that the partnership shall continue its existence during the life time of the partners, each partner may retire at any time; provided, he may not, in the absence of any inevitable reason, retire at a time which would be unfavorable to the partnership.
(2) Even when a period has been fixed for the duration of the partnership, each partner may retire, if any inevitable reason exists therefor.